Objective T o infer the frequency of dosage and m edication history investigate of the victim s in drug facilitated cases by the segm ental analysis of clonazepam in hair. Methods Freezing m illing un-der liquid nitrogen environm ent com bined w ith ultrasonic bath w as used as sam ple pretreatm ent in this study, and liquid chrom atography-tandem m ass spectrom etry w as used for the segm ental analysis of the hair sam ples collected from 6 victim s in different cases. T he concentrations of clonazepam and 7-am in-oclonazepam w ere detected in each hair section. Results C lonazepam and its m etabolite 7-am inoclon-azepam w ere detected in parts of hair sections from the 6 victim s. T he occurrence tim e of drug peak concentration w as consistent w ith the intake tim ing provided by victim s. Conclusion Segm ental analysis of hair can provide the inform ation of frequency of dosage and intake tim ing, w hich show s an unique evidential value in drug facilitated crim es.%目的 通过分段分析头发中的氯硝西泮,对药物辅助犯罪案件中受害人的摄药频度及摄药史进行推断.方法 采用液氮冷冻研磨技术联合超声浴技术,以液相色谱-串联质谱法,对6名不同案件中受害人的头发分段分析,并测定各头发段中的氯硝西泮及7-氨基氯硝西泮的含量.结果 6名受害人的部分头发段中均检出氯硝西泮及其代谢物7-氨基氯硝西泮,且头发中药物峰值浓度的出现时间与受害人自述摄药时间相一致.结论 头发分段分析可提供摄药频度与摄药时间信息,在药物辅助犯罪案件中具有独特的证据价值.
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