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Considerations on expanding criminal offender DNA databases with Y-STR profiles.

Arwin Ralf1, Martin Zieger2, Manfred Kayser1

  • 1Department of Genetic Identification, Erasmus MC University Medical Center Rotterdam, Rotterdam 3015 GD, the Netherlands.

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Summary

Expanding national criminal offender DNA databases with Y-STR profiles aids investigations, especially in sexual assault cases. While offering benefits, legal and privacy concerns require careful consideration for ethical implementation.

Keywords:
European lawRM Y-STRY-STRcriminal offender DNA databasefamilial searchhuman rightssexual assault

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Area of Science:

  • Forensic Genetics
  • Molecular Biology
  • Criminal Justice

Background:

  • Current autosomal short tandem repeat (STR) DNA databases have limitations in solving complex criminal cases.
  • Mixed male-female samples, common in sexual assault cases, pose challenges for traditional DNA profiling.
  • Y-chromosomal STR (Y-STR) profiling offers a complementary approach to autosomal STR analysis.

Purpose of the Study:

  • To evaluate the benefits of expanding national criminal offender DNA databases (NCODDs) with Y-STR profiles.
  • To analyze the legal implications and human rights considerations of incorporating Y-STR data.
  • To stimulate discussion on the practical implementation and ethical aspects of Y-STR database expansion.

Main Methods:

  • Review of existing NCODDs utilizing autosomal STRs.
  • Analysis of Y-STR profiling capabilities, including rapidly mutating Y-STRs (RM Y-STRs) for enhanced discrimination.
  • Legal assessment based on the European Convention on Human Rights and relevant case law.

Main Results:

  • Y-STR profiles enhance database matching in cases with mixed or limited autosomal DNA, particularly for sexual assaults.
  • RM Y-STRs improve the ability to differentiate between paternally related males.
  • Legal analysis suggests Y-STR database use for reidentifying convicted sex offenders aligns with human rights law, but broader applications for familial searching may not.

Conclusions:

  • Expanding NCODDs with Y-STR profiles presents significant forensic advantages for law enforcement.
  • Careful consideration of genetic privacy and human rights is crucial, especially for generalized familial searching.
  • A balanced approach is needed to harness the benefits of Y-STR technology while mitigating potential risks.