A Simple and Effective Physical Characteristic Profiling Method for Methamphetamine Tablet Seized in China |
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| Authors: | Tao Li MS Zhendong Hua PhD Xin Meng PhD Cuimei Liu PhD |
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| Affiliation: | 1. National Narcotics Laboratory, Drug Intelligence and Forensic Center of the Ministry of Public Security, Beijing, China;2. National Narcotics Laboratory, Drug Intelligence and Forensic Center of the Ministry of Public Security, Beijing, ChinaFinancial support provided by the Program of National Science & Technology Pillar (2011BAK04B06) and the National Key Research and Development Program of China (2016YFC0800903). |
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| Abstract: | Methamphetamine (MA) tablet production confers chemical and physical properties. This study developed a simple and effective physical characteristic profiling method for MA tablets with capital letter “WY” logos, which realized the discrimination between linked and unlinked seizures. Seventeen signature distances extracted from the “WY” logo were explored as factors for multivariate analysis and demonstrated to be effective to represent the features of tablets in the drug intelligence perspective. Receiver operating characteristic (ROC) curve was used to evaluate efficiency of different pretreatments and distance/correlation metrics, while “Standardization + Euclidean” and “Logarithm + Euclidean” algorithms outperformed the rest. Finally, hierarchical cluster analysis (HCA) was applied to the data set of 200 MA tablet seizures randomly selected from cases all around China in 2015, and 76% of them were classified into a group named after “WY‐001.” Moreover, the “WY‐001” tablets occupied 51–80% tablet seizures from 2011 to 2015 in China, indicating the existence of a huge clandestine factory incessantly manufacturing MA tablets. |
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| Keywords: | forensic science methamphetamine tablet physical characteristic profiling receiver operating characteristic hierarchical cluster analysis |
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