Guidance

DNA mixture interpretation (FSR-G-222)

This guidance sets out the approach for the interpretation of DNA mixture profiles.

• From: Forensic Science Regulator
• Published: 31 July 2018
• Last updated: 22 July 2024
  Show all updates

  1. 22 July 2024

     Added accessible version.

  2. 22 September 2020

     Updated guidance and improved accessibility of PDF.

  3. 31 October 2018

     DNA mixture interpretation, FSR-G-222: Issue 2 added.

  4. 29 October 2018

     Issue 2 of the DNA mixture interpretation, FSR-G-222 added.

  5. 20 September 2018

     Guidance updated.

  6. 31 July 2018

     First published.

Documents

DNA mixture interpretation (accessible)

Ref: FSR-G-222

HTML

DNA mixture interpretation

Ref: FSR-G-222

PDF, 525 KB, 64 pages

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Details

The document includes:

• standardised terminology to be used
• the acceptable boundaries for the interpretation of complex DNA mixture profiles
• the interpretation of a variable number of contributors to a DNA mixture profile
• the use and limitations of a qualitative opinion where no quantitative measure can be calculated
• guidance for the interpretation content for reports and statements

Issue 2 of this document updates:

• the position for guideline 16
• the qualitative evaluation of the strength of evidence, and the major and minor approach - discussed in the ISFG’s DNA commission of the international society for forensic genetics: Assessing the value of forensic biological evidence