ISO 21043-5:2025 PDF

Overview

ISO 21043-5:2025 - Forensic sciences - Part 5: Reporting - specifies requirements and recommendations for forensic reporting of work performed at a scene and within a facility. The standard aims to ensure reports are accurate, clear, transparent, complete, unambiguous, impartial and suitable for their intended use. It covers report content, administrative controls, item integrity, measurement uncertainty, how opinions (including probabilities and likelihood ratios) are reported, case file review, report issuance and control, and requirements related to testimony.

Key Topics and Requirements

• Report content: must describe items (unique identifiers), examinations performed, results (observations and opinions), and responsible persons. Reports should reference requests, collection dates, methods used, supporting data and appendices.
• Administrative elements: title identifying the document as a report, unique report ID, issue date, case identifier, provider name, pagination, end-of-report marker, and signatory (or e-signature).
• Item integrity: document packaging/condition and any mitigating actions if item integrity is compromised.
• Measurement uncertainty & significant figures: report measurement uncertainty where relevant and support reported significant figures by the method’s uncertainty.
• Reporting opinions: differentiate observations from opinions; conform to ISO 21043-4 for interpretation; include questions, propositions, assumptions and basis for opinions. Avoid overstating or presenting opinions as facts.
• Probabilities & likelihood ratios (LRs): describe data or models used; report numerical values when calculated; when using LRs, clearly state they are ratios of probabilities of observations given competing propositions and avoid the transposed conditional (prosecutor’s fallacy).
• Estimations: report numerically with uncertainty.
• Case file review: technical and administrative review should be undertaken (preferably before issuing reports).
• Issuance and control: procedures for authorizing examiners to issue reports, supplementing, amending or withdrawing reports, and controlling dissemination.
• Testimony: requirements for testimony and training/evaluation of witnesses.

Applications and Users

ISO 21043-5 is intended for:

• Forensic service providers and laboratory managers drafting or controlling forensic reports.
• Forensic examiners and crime-scene personnel preparing findings for investigators or courts.
• Quality managers and accreditation bodies applying reporting controls and policies.
• Legal professionals and prosecutors/defense counsel who rely on clear, transparent forensic reports.
• Training coordinators preparing testimony and report-writing guidance.

Practical uses include standardizing report templates, documenting limitations and assumptions, improving courtroom testimony consistency, and ensuring measurement uncertainty and likelihood ratios are reported responsibly.

Related Standards

• ISO 21043-1 - Vocabulary (terms and definitions referenced).
• ISO 21043-4 - Interpretation (requirements for forming and reporting opinions).
• Other parts of the ISO 21043 series address the broader forensic process from scene to courtroom.