Animal Species and Identity Testing: Developments, Challenges, and Applications to Non-Human Forensics

Area of Science:

• Forensic Science
• Wildlife Forensics
• Molecular Biology

Background:

• Wildlife crime investigations involve analyzing non-human biological samples, presenting unique forensic DNA challenges.
• Unlike human identity testing, non-human species identification is complicated by diverse targets, varied sample types (feathers, processed parts), and degraded DNA.
• Existing methods struggle with low DNA quantities, inhibitors, contamination, and the lack of standardized forensic kits for wildlife.

Purpose of the Study:

• To highlight the complexities and deficiencies in current forensic DNA analysis for non-human species.
• To underscore the need for specialized analytical approaches and validated tools for wildlife forensics.
• To identify gaps in investigative capabilities, particularly for CITES-listed organisms.

Main Methods:

• Review of challenges in non-human forensic DNA analysis, including sample types and DNA quality.
• Discussion of mitochondrial DNA (mtDNA) analysis, its advantages (sensitivity, datasets), and limitations (resolution, NUMTs, hybrids).
• Examination of the development and limitations of species-specific genetic markers and the lack of validated forensic tools.

Main Results:

• Mitochondrial DNA (mtDNA) analysis is common due to available data and sensitivity but can lack species resolution and hybrid detection.
• Validated, species-specific forensic markers are scarce, especially for CITES-listed species, hindering enforcement.
• Human DNA contamination risk during evidence collection is an additional concern.

Conclusions:

• Significant gaps exist in validated forensic analytical tools for non-human species, impacting wildlife crime investigations.
• The development of specialized, validated kits and markers is essential to enhance wildlife forensics.
• Inadequate funding, limited reference samples, and training infrastructure impede progress in this field.