THE GOLD STANDARD OF JUSTICE · SPECIALIST STUDY
Treat an informant account as motivated evidence that must remain independently testable
Informants can provide access and information unavailable through ordinary investigation, but their evidence arrives through relationships, incentives and risks that must be made visible. A confidential informant, cooperating witness, co-defendant and jailhouse informant do not present the same reliability or safety questions. A sound process documents motivation and benefits, traces the source of each detail, separates first-hand observation from hearsay, prevents investigators from feeding protected facts, corroborates important propositions independently, preserves handler contacts and discloses credibility material under the governing law.
This guide belongs to the Justice subject root, the Gold Standard of Education, and the How X Works hub. It begins with a concrete decision, then tests whether the method still holds when the context changes.
Choose a reading route
Classify the source and motivation · chapters 1, 2, 3
Control handling and information flow · chapters 4, 5
Work corroboration and reliability · chapters 6, 7, 8
Disclose, test and protect · chapters 9, 10, 11
Audit, remedy and transfer · chapters 12, 13
The whole problem at a glance
| Question | Evidence needed | Unsafe shortcut |
|---|---|---|
| Who is the source? | Type, history, relationship and access | All informants are interchangeable |
| Why provide information? | Benefits, pressure, safety and motive | Past help proves current truth |
| How was the detail learned? | First-hand basis and disclosure timeline | Correct detail must be independent |
| What supports it? | Independent corroboration and credibility disclosure | The account corroborates itself |
Reliability is proposition-specific and time-specific; one accurate tip does not validate every later claim.
CHAPTER 1 OF 13 · Classify the source and motivation
1. Distinguish source types before applying safeguards
Classify confidential informants, sources of information, cooperating defendants, witnesses and jailhouse informants under the relevant policy and law. Record role changes over time. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A person begins as a tipster, then enters a cooperation agreement after arrest. The file preserves both phases rather than treating all statements as one source relationship. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: identity under protected access; role and policy definition; dates; case relationship; custody; agreements; handler and prosecutor Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Different source types carry different authority, disclosure, incentive and safety rules; one generic “informant” label hides them. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Move the source from community contact to co-defendant and rebuild the conflict and benefit analysis. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 1 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 2 OF 13 · Classify the source and motivation
2. Map incentives, pressures and competing loyalties
Record money, charging or sentencing expectations, immigration or housing concerns, revenge, status, safety, addiction, coercion and relationships. Separate promised, requested, hoped-for and later benefits. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A source asks whether cooperation will help at sentencing. The agent records the request and explains who has authority rather than implying a result. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: payment and expenses; agreements; requests; charging status; custody conditions; threats; relationships; prior benefits; decision authority Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Motivation does not prove falsity, but hidden incentive prevents a decision-maker from evaluating credibility fairly. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Remove financial payment but add a family conflict and show why the motive map remains necessary. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 2 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 3 OF 13 · Classify the source and motivation
3. Trace the basis of knowledge and every information hop
Ask what the source personally perceived, when, where and how. Separate direct observation, participant admission, rumour, another informant and investigator-supplied information. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A source says a friend described the offence. The file identifies both information hops and does not present the account as eyewitness knowledge. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: verbatim account; dates and locations; relationship; access; hearsay chain; media exposure; prior interviews; exhibits shown Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Specific detail is not strong evidence when the source’s route to that detail is unknown or contaminated. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Add a social-media post and decide whether it is the true source of the supposedly inside information. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 3 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 4 OF 13 · Control handling and information flow
4. Assess suitability before registration or use
Review reliability history, criminal conduct, danger, vulnerability, conflicts, privileged roles, potential investigative harm and ability to follow instructions under the governing policy. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A proposed source has useful access but a history of fabricating information for payment. Approval requires senior review and narrowed tasks rather than routine registration. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: initial suitability report; criminal and cooperation history; reliability; affiliations; risks; conflicts; approval; review schedule Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Operational value does not cancel safety, legality or credibility risk, and past reliability should not become permanent certification. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Keep the source but change the target to a close family member and reassess conflict and voluntariness. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 4 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 5 OF 13 · Control handling and information flow
5. Set written instructions, authority and contact controls
Explain truthfulness, voluntariness, confidentiality limits, prohibited conduct, benefit authority, emergency contacts and recording rules. Use witnessed or otherwise documented instructions and repeat them. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A source proposes an unauthorised purchase. The handler refuses, records the request and seeks the approval required before any controlled activity. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: instruction form and date; witnesses; prohibited acts; authorised conduct; contact method; emergency plan; handler pair; supervisor Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: An investigator cannot privately authorise benefits or conduct reserved to prosecutors, courts or senior officials. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Move contact to encrypted messaging and design preservation, access and emergency controls. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 5 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
Worked informant review
| Observation | Risk | Next evidence | Protection |
|---|---|---|---|
| Source seeks sentence benefit | Motivated account | Record request and prosecutor decision | No implied guarantee |
| Detail appears distinctive | Police may have disclosed it | Contact and disclosure timeline | Do not call it secret knowledge yet |
| Second informant agrees | Shared source or collusion | Independence map | Avoid false corroboration |
| Account changes | Correction or fabrication | Versioned interviews and external facts | Preserve every version |
Incentive does not make evidence automatically false; it makes documentation and testing essential.
CHAPTER 6 OF 13 · Work corroboration and reliability
6. Record contacts and prevent information feeding
Preserve each meeting, call, payment, instruction, source statement, question and item shown. Limit disclosure of protected case facts to what is operationally necessary. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A handler mentions an unreleased scene detail before the source repeats it. The chronology prevents that detail from being presented later as independent confirmation. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: contemporaneous notes; recordings where lawful; participants; exact disclosures; exhibits; payments; travel; source output; corrections Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: A polished summary cannot reveal who introduced a detail or how the source’s language changed across contacts. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Lose one contact record and state how the reliability claim and disclosure package must be limited. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 6 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 7 OF 13 · Work corroboration and reliability
7. Corroborate material propositions independently
Test identity, opportunity, timing, method and distinctive facts using evidence that did not originate from the source. Record negative and contradictory findings. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: The source predicts a meeting time. Independent location and communications evidence confirm the meeting but not the alleged purpose, so the claim remains bounded. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: physical and digital evidence; surveillance; records; other witnesses; provenance; timestamps; alternative explanations; negative results Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Corroborating innocent background details does not automatically validate an accusation, intent or every element of an offence. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Keep identity confirmed but remove evidence of intent and show which proposition remains unsupported. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 7 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 8 OF 13 · Work corroboration and reliability
8. Work a complete informant case
Join suitability, motive, instructions, contact chronology, information sources, corroboration, benefits, disclosure and safety decisions in one reviewable record. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A fictional cooperating source gives a detailed account while seeking a charging benefit. Two details were previously disclosed; one material fact is independently confirmed; another conflicts with records. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: source file; agreements; exact statements; disclosure timeline; benefits; corroboration matrix; conflicts; safety plan; prosecutor review Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: The case illustrates evidence testing, not guilt. A source can be useful, inaccurate in part and motivated at the same time. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Change the source to a jailhouse informant who heard an alleged confession and rebuild access, motive and contamination checks. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 8 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 9 OF 13 · Disclose, test and protect
9. Test independence among multiple informants
Map contact, custody, discovery, media, common handlers and shared associates before treating agreement as corroboration. Use different interview teams or sequencing where feasible. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: Two detainees report the same phrase but shared a housing unit and case paperwork. Their agreement is not counted as two independent sources. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: housing and contact; communications; discovery access; media; interview order; handlers; shared language; benefits Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Apparent convergence can be produced by collusion, common contamination or repeated investigator prompts. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Separate the informants before either interview and identify what additional evidence would support independence. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 9 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
Informant-evidence gate
| Gate | Pass evidence | Remain open when |
|---|---|---|
| Suitability | Identity, motive, risk and authority reviewed | Conflicts or danger unresolved |
| Collection | Contacts and information sources recorded | Unrecorded handler exchange exists |
| Corroboration | Material propositions independently tested | Only source-derived facts agree |
| Disclosure | Credibility material and benefits preserved | File access or duty is incomplete |
Confidentiality and safety can require protective measures, but they do not erase legal disclosure or judicial oversight.
CHAPTER 10 OF 13 · Disclose, test and protect
10. Preserve and disclose credibility material
Review the whole relevant source file for agreements, payments, validation, prior falsehoods, criminal conduct, inconsistent statements and benefits as required by law and court orders. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A prior unrelated file contains a documented fabrication. Prosecutors identify it for disclosure review rather than limiting the search to the present case summary. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: source and agency files; agreements; payments; reliability assessments; prior testimony; misconduct; inconsistencies; disclosure log Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Confidential or administrative labels do not by themselves remove discoverable credibility information from review. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Move the source across agencies and design a request that reaches relevant outside files. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 10 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 11 OF 13 · Disclose, test and protect
11. Balance confidentiality, safety and fair testing
Use protective orders, redaction, delayed disclosure or witness-protection measures only under lawful authority while preserving defence access and judicial oversight. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: A credible threat emerges. The court receives a specific safety record and considers tailored protection rather than a blanket refusal to disclose credibility evidence. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: threat assessment; identity risk; legal obligation; protective options; defence need; court order; access log; breach plan Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Safety and fairness are both real interests; invoking one in the abstract does not resolve the particular conflict. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Reduce the threat after relocation and review whether earlier restrictions remain proportionate. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 11 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 12 OF 13 · Audit, remedy and transfer
12. Present testimony, instructions and limits accurately
Keep source testimony within personal knowledge, disclose incentives and prior inconsistencies, and avoid vouching by agents or prosecutors. Use appropriate judicial directions under local law. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: An agent explains the documented cooperation process but does not tell the fact-finder that the source is truthful because the agency used them. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: witness statement; benefits; preparation record; disclosure; limits of knowledge; objections and rulings; jury or judicial instructions Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: Government use, corroboration of some facts or a guilty plea does not certify every statement the source makes. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Remove the source from live testimony and assess how hearsay and confrontation rules change. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 12 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
CHAPTER 13 OF 13 · Audit, remedy and transfer
13. Audit outcomes, correct records and provide remedy
Review source reliability across cases, benefits, complaints, deviations, disclosure failures and wrongful-conviction signals. Reopen affected matters when new credibility evidence emerges. The working unit is one identified source under protected handling, one information episode, one evidential proposition and one documented decision under the governing law. State the person, specimen, assertion, decision or evidence item being examined, the version and time boundary, and the claim that remains outside scope.
Worked example: An audit finds a source fabricated in another case. The agency identifies every use, notifies prosecutors and creates an independent review and correction trail. Put the starting evidence, decision, later observation and consequence on separate lines. This chronology prevents a coherent story from replacing a reproducible account.
Evidence to retain: cross-case source index; use and outcome denominators; falsehoods; payments; deviations; disclosure incidents; affected-case review; corrective action Attach provenance, dates, versions, custody and decision use. Record inaccessible evidence explicitly; absence is not a negative result and must not be converted into reassurance.
Boundary and misconception: A source-by-source success rate can be misleading when failed tips, dismissed cases and unrecorded contacts are missing from the denominator. Test a credible competing explanation and name what evidence would change the conclusion. The pass condition is a bounded, reviewable claim rather than a promise that the method removes uncertainty.
Evidence discipline: record the observation, version or time boundary that supports this chapter’s conclusion. Preserve the rejected alternative as well as the selected action. That makes a later review able to distinguish a changed world from an undocumented change of mind.
Changed-context transfer: Transfer the audit from one agency to a multi-agency task force and rebuild ownership and file access. The method transfers only if the decision question and measurement meaning survive the change. If either changes, rebuild the comparison rather than copying the earlier threshold or weight.
Chapter 13 check · what should survive an audit
- Name the decision, unit, time boundary and responsible authority.
- Preserve supporting evidence and the strongest rejected explanation.
- Record the next action, review date, stop rule and reopening condition.
Verification lab: work the decision twice
Build a fictional source file with suitability, instructions, three contacts, one payment request, one disclosed fact and two independent corroboration attempts.
Repeat the case with a jailhouse informant who had discovery access. Map every route by which distinctive details could have been learned.
Create a disclosure checklist spanning handler notes, source validation, agreements, payments, prior testimony, misconduct and outside-agency files.
Final review: distinguish operational usefulness, source credibility, proposition reliability, independent corroboration and legal admissibility. If one handler’s confidence is doing all five jobs, the evidence is overclaimed.
Limits and misconceptions
Informants are not one source category
Confidential sources, cooperating defendants and jailhouse informants create different risks and rules.
Incentive is evidence, not automatic disqualification
Record it so reliability can be evaluated and tested.
Agreement is not always independence
Shared custody, discovery, media or handlers can create false corroboration.
Confidentiality does not erase review
Safety measures must coexist with governing disclosure duties and judicial oversight.
Questions readers ask
Does payment make an informant unreliable?
- Not automatically, but payment and all other incentives must be recorded and considered with independent evidence.
What counts as corroboration?
- Evidence obtained independently that tests a material proposition, not merely background detail supplied by the source.
Why review the full source file?
- Credibility material may appear in agreements, prior cases, payments, validation records and documented falsehoods.
Can two informants corroborate each other?
- Only if their information is genuinely independent; shared access or contamination can make agreement circular.
Must an informant’s identity always be disclosed?
- Rules vary. Courts may use protective measures, but confidentiality is governed by law and cannot be assumed absolute.
What happens when later falsehood is discovered?
- Affected cases and disclosures should be identified and reviewed under the governing law, with correction and remedy where required.
Practise, verify and continue
Build an informant evidence map with source type, motive, suitability, authority, contacts, disclosed facts, detail sources, benefits, corroboration, conflicts, disclosure, safety measures and affected-case review.
Apply the method to an anonymous whistleblower. Preserve source tracing, motive, independent corroboration, record integrity and protection, while rebuilding employment, retaliation, privilege and public-interest rules.
Practical evidence check
Before implementation, write a one-page evidence map with the decision, unit of analysis, version or time boundary, inputs, outcomes, uncertainty, authority and stop rule. Attach one worked case that passes and one that fails. A reviewer should be able to reproduce the reasoning without relying on the memory of the person who built the system.
Run one changed-context rehearsal before approval. Alter a mechanism rather than a cosmetic detail, then identify which calculation, safeguard or governance gate must change. Record any conclusion that does not transfer. This short rehearsal is often the fastest way to expose a hidden assumption before it becomes an operational dependency.
Related eduKate reading
Evidentiary justice, reliability and contestability
Disclosure timeliness, defence access and remediation
Wrongful-conviction review and remedy
Prosecutorial independence, recusal and review
Authoritative sources and scope
United States Department of Justice confidential informant guidelines
DOJ Office of Inspector General review of confidential informant guidelines
DOJ Justice Manual on discovery and confidential-source files
National Institute of Justice report on policing and wrongful convictions
These sources support general safeguards and evidence practices. They do not define the law of every jurisdiction, determine admissibility or decide an individual case. All worked cases are fictional. Actual investigations, disclosure, expert evidence, witness safety and remedies require the governing law, competent counsel and the responsible authority or court.