Hair Head and Pubic 51 Forensic Evidence

Hair is most commonly sampled to detect body fluids or retrieve foreign hairs or particles. It has been known for many decades that numerous ingested, prescribed, and illicit drugs (e.g., barbiturates, amphetamines, opiates, cocaine, benzodiazepines, y-hydroxy butyrate, and cannabis) are deposited in the hair (44). Although toxicology of hair was originally used to detect drugs that had been repeatedly ingested, recent advances in analytical techniques have meant that toxicology may be useful after single-dose ingestion as would occur in a substance-facilitated sexual assault (45,46). This is particularly pertinent because complainants of possible drug-facilitated sexual assaults frequently do not report the incident expeditiously because of amnesia and/or doubt about what might have happened, and drugs may be accessible to analysis for longer periods in hair compared to blood or urine (47). In addition, it may be used as a reference sample for DNA analysis.

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