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Forensic drugs testing. Image 1 of 3. Drugs being tested as evidence against suspected drug dealers. Cocaine (white) is an alkaloid drug from the coca plant (Erythroxylon coca). Hashish (brown) is derived from the cannabis plant (Cannabis sativa). For a sequence showing the results of the tests on these drugs, see image H200/196-198. (KEYSTONE/SCIENCE PHOTO LIBRARY/MAURO FERMARIELLO) === ===