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Forensic Drug Analysis

Forensic Drug Analysis. Screening and Confirmation. Forensic Scientists determine the identity of drugs using… Screening Tests – preliminary tests used to reduce the # of possible identities of an unknown substance (color tests & microcrystalline tests)

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Forensic Drug Analysis

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  1. Forensic Drug Analysis

  2. Screening and Confirmation Forensic Scientists determine the identity of drugs using… • Screening Tests – preliminary tests used to reduce the # of possible identities of an unknown substance (color tests & microcrystalline tests) • Confirmation – a single test that specifically identifies a substance.

  3. Qualitative vs. Quantitative Identification of drugs may be… • Qualitative – descriptive (An unknown sample may be determined to contain heroin and quinine.) • Quantitative-amount (A sample may be determined to contain 10 % heroin and 90% quinine)

  4. Color Tests • When mixed with a certain reagent, a drug can produce a characteristic color • Useful for field investigators • Screening tests only • YouTube - Spray drug test kit for Cocaine residue detection Heroin Meth

  5. Color Tests • Marquis – heroin, morphine, opium derivatives (purple) amphetamines (orange-brown) • Dille-Koppanyi-barbiturates (violet -blue) • Duquenois-Levine – marijuana (purple) • Van Urk – LSD (blue-purple) • Scott test – cocaine (blue)

  6. After color test… • A more analytical test must be conducted to get rid of any false positives. • These test could include: • Chromatography –separate mixtures of drugs • Spectrophotometer- shows how molecules are bonded

  7. Flow Chart

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