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Hair analysis as evidence in forensic cases
1Institute of Legal Medicine, University of the Saarland, Homburg, Germany.
Forensic Science International
|December 1, 1993
Summary
Hair analysis offers crucial evidence for determining drug use months after consumption. Advanced GC/MS methods distinguish heroin from codeine use, aiding legal cases with reliable drug testing data.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
Background:
- Hair analysis provides a long-term record of drug consumption, valuable in legal contexts.
- Radioimmunoassay techniques had limitations in distinguishing chronic heroin and codeine use.
Purpose of the Study:
- To establish reliable criteria for differentiating heroin and codeine use via hair analysis.
- To enhance the sensitivity and specificity of drug testing in forensic toxicology.
Main Methods:
- Gas Chromatography/Mass Spectrometry (GC/MS) for sensitive drug detection.
- Analysis of morphine/codeine ratios and the metabolite monoacetylmorphine (MAM).
Main Results:
- Defined morphine/codeine ratios (5:1 for <1 ng/mg, 2:1 for >1 ng/mg) to indicate heroin use.
- Monoacetylmorphine analysis provides further confirmation.
- Established ranges for amphetamine, cocaine, and cannabis use.
Conclusions:
- Hair analysis, particularly with GC/MS, is a powerful tool for validating or invalidating self-reported drug use.
- Interpretations of hair drug testing results require caution.
- Ongoing research aims to develop safety guidelines for various drug analyses.