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Issues about axial diffusion during segmental hair analysis.

Pascal Kintz1

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Summary
This summary is machine-generated.

Interpreting single drug exposure in hair requires careful analysis. A proposed method suggests the highest drug concentration in the relevant hair segment, at least three times higher than adjacent segments, validates a single event.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Pharmacology

Background:

  • Detecting single drug exposure in hair is crucial for legal cases like doping and drug-facilitated crimes.
  • Interpreting positive results in consecutive hair segments presents a significant challenge due to variable drug distribution.

Purpose of the Study:

  • To establish a validated theory for confirming single drug exposure in hair, even when detected in multiple segments.
  • To provide practical guidelines for hair sample collection and analysis in forensic toxicology.

Main Methods:

  • Evaluation of existing literature and 20 years of author's hair drug testing experience.
  • Analysis of hair samples, segmenting 2 cm strands based on a 1 cm/month growth rate.
  • Development of criteria for qualifying a single exposure based on drug concentration ratios between segments.

Main Results:

  • A single dose is typically indicated by drug presence only in the proximal hair segment.
  • Approximately 10% of cases show drug detection in 2-3 consecutive segments, attributed to irregular distribution or diffusion from sweat.
  • Proposed criteria: highest concentration in the segment corresponding to the event, at least 3x higher than adjacent segments.

Conclusions:

  • The proposed criteria, considering concentration gradients and hair growth rates, can validate single drug exposure in forensic cases.
  • Careful hair collection near the scalp and consideration of hair matrix interferences are essential for accurate results.
  • This approach addresses the complexities of drug incorporation and distribution in hair shafts.