Overview
EN ISO 21043-3:2025 - Forensic sciences - Part 3: Analysis (ISO 21043-3:2025) specifies requirements and recommendations to safeguard the forensic analysis process for items of potential evidential value. It covers the selection and application of suitable analytical methods to meet customer requests, and sets expectations for method suitability, controls, qualified personnel and analytical strategies. The standard applies to activities carried out by a forensic service provider both at the scene and inside facilities, across all forensic disciplines except the recovery of digital data (see ISO/IEC 27037).
Key topics and requirements
- Documented procedures and method suitability: Procedures for analysis must be documented, appropriate for intended use, and include method limitations.
- Method validation and verification: Analytical methods, software and measurements require validation before implementation; externally validated methods must be verified locally.
- Equipment, calibration and performance checks: Requirements for maintenance, calibration, performance parameters and metrological traceability to support reliable observations.
- Reference and control samples: Use and management of reference samples, control samples, collections and databases to support analytical quality.
- Measurement uncertainty & significant figures: Expectations to assess and report uncertainty where relevant to interpretation.
- Personnel and competence: Qualified examiners and records of who performed analyses and with which equipment/consumables.
- Environmental and facility controls: Consideration of environmental conditions and facility requirements that can affect analytical outcomes.
- Analytical strategy and sampling: Guidance on assessment prior to analysis, method selection, item selection, sampling and preparation.
- Recording, deviations and traceability: Detailed record-keeping of observations, methods, deviations and chain-of-custody elements to support reproducibility and legal defensibility.
Practical applications and users
EN ISO 21043-3:2025 is designed for organizations and professionals involved in forensic analysis, including:
- Forensic service providers and laboratory managers
- Crime scene investigators and evidence recovery teams
- Police forensic units and public forensic institutes
- Independent forensic laboratories and consultants
- Quality managers and accreditation assessors ensuring compliance with forensic standards
Use cases include development or review of laboratory procedures, method selection and validation workflows, preparation for accreditation, improving chain-of-custody practices, and strengthening the scientific defensibility of forensic reports presented in legal proceedings.
Related standards
- ISO 21043-1 - Forensic sciences - Part 1: Vocabulary
- ISO 21043-2 - Forensic sciences - Part 2: Recognition, recording, collecting, transport and storage of items
- ISO/IEC 27037 - Guidelines for identification, collection and preservation of digital evidence (digital data recovery excluded from ISO 21043-3)
- Other parts of the ISO 21043 series (Parts 4 & 5) cover additional forensic-process components
Keywords: EN ISO 21043-3:2025, forensic analysis, forensic science standard, method validation, metrological traceability, analytical strategy, forensic service provider.
