Hair is the matrix of choice in forensic toxicology when retrospective analysis is needed. Nonetheless, due to misalignment, different growth stages and segmentation lengths of 0.5-1 cm, resolution of time is limited. By segmental analysis of single hairs, most of these factors can be compensated and resolution of time is enhanced.

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Hair analysis has become a valuable and widely accepted routine method in forensic and clinical toxicology, as well as in work-place drug testing. Main applications are the proof of abstinence or the evaluation of drug use during the past months. 1,2 However, hair is a rarely used specimen in doping control. So far, only blood and urine samples are considered in the Code of the World Anti-Doping Agency (WADA). 3 According to a consensus on hair testing for doping agents released by the Society of Hair Testing (SoHT), hair is not a suitable

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