Forensic Evidence Chain-of-Custody (Active)

Detects documents containing forensic evidence details, DNA or fingerprint matches, ballistics results, and chain-of-custody documentation for active criminal prosecutions. Premature disclosure enables defence challenges to evidence integrity that can collapse prosecutions for serious offences.

Type: keyword_proximity
Engine: universal
Confidence: high
Confidence justification: High confidence: requires co-occurrence of forensic evidence chain-of-custody terminology with active prosecution markers and exhibit reference numbers. The proximity requirement for active prosecution terms (committal, indictment, trial date) distinguishes active cases from historical or concluded matters.
Jurisdictions: au
Regulations: Evidence Act 1977 (Qld), PPRA 2000 (Qld)
Frameworks: QGISCF
Data categories: law-enforcement, government
Scope: wide
Risk rating: 8

Pattern

(?i)\b(chain\s+of\s+custody|exhibit\s+register|forensic\s+(?:evidence|certificate)|DNA\s+profile\s+match|fingerprint\s+(?:match|identification)|ballistics\s+(?:match|analysis|report)|toxicology\s+results?)\b

Corroborative evidence keywords

PROTECTED, Law-Enforcement, exhibit, prosecution brief, committal, indictment, trial date, active prosecution, forensic certificate, Queensland Health Forensic, QHFSS, scene of crime, SOCO, evidence bag, evidence seal, laboratory analysis, investigation, enforcement, prosecution, arrest (+26 more)

Proximity: 300 characters

Should match

PROTECTED Law-Enforcement. Forensic Evidence — Chain of Custody Register. Case: R v MARTINEZ, Indictment No. 2025/1847. Exhibit QPS-EX-2025-00342: Blood sample collected from scene. DNA profile match to accused confirmed by QHFSS. Forensic certificate issued. Chain of custody: SOCO Constable L. PARK collected 14/01/2025, sealed evidence bag #EV-78234, transferred to QHFSS 15/01/2025. — Active prosecution forensic evidence register with DNA match and chain-of-custody details
Prosecution brief — exhibit register update. Trial date: 15 September 2025. Exhibit QPS-EX-2025-00187: Firearm recovered from suspect vehicle. Ballistics match confirmed — projectile from victim matched to seized weapon. Chain of custody maintained by four officers. Forensic certificate and continuity statements attached. — Prosecution brief exhibit register with ballistics match for upcoming trial
Forensic evidence summary for committal hearing. Re: Operation JASPER. Fingerprint match identified on drug packaging — latent print lifted from exhibit QPS-EX-2024-01294 matches accused. Toxicology results from seized substance: 78% purity methylamphetamine, 2.4 kg gross weight. Chain of custody documentation complete. — Committal hearing forensic evidence summary with fingerprint and toxicology results

Should not match

The Queensland Health Forensic and Scientific Services published its annual report noting that 12,500 DNA analyses were completed during the year. The laboratory maintained NATA accreditation for all forensic testing. — Published QHFSS annual report with aggregate laboratory statistics
A forensic science training manual explains chain of custody procedures for police recruits. The manual uses fictional case studies to demonstrate proper evidence handling and documentation. — Police training manual with fictional chain-of-custody examples
The judge in the concluded murder trial noted that the chain of custody for the DNA evidence was properly maintained throughout. The accused was convicted and sentenced to life imprisonment. — News report about concluded trial where evidence was admitted

Known false positives

Forensic laboratory annual reports with aggregate testing statistics Mitigation: Negative keyword exclusion: 'annual report', 'published', 'reporting period', 'NATA accreditation'. Require proximity to specific case numbers.
Police training materials about evidence handling procedures Mitigation: Negative keyword exclusion: 'training manual', 'training exercise', 'fictional', 'case study', 'police recruit', 'simulated'
Media reporting on concluded trials where evidence was publicly discussed Mitigation: Negative keyword exclusion: 'convicted', 'sentenced', 'concluded', 'acquitted', 'verdict', 'judge noted', 'court heard'