The authors first describe events that led to the arrest of the defendant, followed by a summary of the jury trial. Investigators subjected cocaine found in the defendant's suitcase and wallet to chemical derivatization and three gas chromatographic methods for the detection and relative quantification of cocaine manufacturing impurities and by-products. The cocaine impurities included cis- and trans-cinnamoylcocaine, the isomeric truxillines, and the hydroxy-cocaines. Among the cocaine manufacturing byproducts detected were benzoylecgonine, ecgonine methyl ester, exgonine, N-benzoylnorecogonine methlester, and N- norcocaine. Chemical derivatization of the cocaine samples was accomplished with the use of heptafluorobutyric anhydride and N,O-bis(trimethylsilyl)acetamide. The derivatized impurities/byproducts were subjected to capillary gas chromatographic analysis with the use of flame ionization and electron-capture detectors. The comparative chemical analyses yielded a positive correlation between the cocaine samples in the suitcase and the wallet. 4 tables, 5 figures, and 20 references