DNA typing as a strategy for resolving issues relevant to forensic toxicology

Area of Science:

• Forensic Science
• Toxicology
• Genetics

Background:

• Aircraft accident investigations often involve fragmented and degraded biological samples, complicating toxicological analysis and victim identification.
• Challenges include commingled remains, contamination, and putrefaction, which can lead to errors in sample analysis and interpretation.

Purpose of the Study:

• To demonstrate the utility of DNA typing in overcoming difficulties in forensic toxicology investigations of aircraft accident victims.
• To exemplify how DNA analysis can resolve issues related to tissue mismatching, analytical errors, and unusual toxicological findings.

Main Methods:

• Utilized polymerase chain reaction (PCR)-based DNA typing to analyze six independently inherited genetic loci.
• Applied PCR to examine degraded DNA samples commonly found in putrefied or contaminated postmortem specimens.

Main Results:

• DNA analysis successfully identified commingled specimens from different individuals, preventing misattribution in toxicological evaluations.
• It pinpointed an analytical error in a cyanide batch analysis by comparing DNA profiles of batch and control samples.
• Confirmed sample identity in a case with unusual drug distribution, supporting a hypothesis of localized administration.

Conclusions:

• PCR-based DNA typing is a robust tool for enhancing the effectiveness of forensic toxicology operations.
• It provides crucial data for accurate victim identification, sample integrity verification, and reliable interpretation of toxicological results in challenging postmortem cases.