Presentation on theme: "ID, Collection of Evidence"— Presentation transcript:
1 ID, Collection of Evidence 9.4 NotesID, Collection of Evidence
2 ObjectivesDescribe the laboratory tests normally used to perform a routine drug identification analysisUnderstand proper collection and preservation of drug evidence
3 Drug Identification Either a specimen is a specific drug or it is not Chemists must be prepared to support and defend the validity of the results in a court of lawScreening test – reduces possibilitiesfirst test is color testConfirmation test - pinpointing
4 Drug Identification cont. The procedures must be able to confirm that the likelihood of any other substance responding in an identical manner to a certain drug is so minimal that there exists no other conclusion but reasonable scientific certainty
5 Analytical schemes Color tests Microcrystalline tests Chromatography SpectrophotometryMass Spectrometry
6 Color Tests1. Marquis reagent – purple with heroine and morphine; orange with amphetamines2. Dillie-Koppanyi – violet blue with barbiturates3. Duquenois-Levine – ABC layers with layer C purple with marijuana4. Van Urk – purple/blue with LSD5. Scott Test – ABC (A with cocaine, blue to pink in B, and blue again in C layer)
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