Citation

Li T, Hua Z, Meng X, Liu C. J. Forensic Sci. 2018; 63(2): 541-547.

Affiliation

National Narcotics Laboratory, Drug Intelligence and Forensic Center of the Ministry of Public Security, Beijing, 100193, China.

Copyright

(Copyright © 2018, American Society for Testing and Materials, Publisher John Wiley and Sons)

DOI

10.1111/1556-4029.13554

PMID

28643439

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.

© 2017 American Academy of Forensic Sciences.

Language: en

Keywords

forensic science; hierarchical cluster analysis; methamphetamine tablet; physical characteristic; profiling; receiver operating characteristic