5.3 Forensic Drug Analysis

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5.3 Forensic Drug Analysis Powered By Docstoc
					5.3 Forensic Drug Analysis

          11.16.09
     Screening and Confirmation
   Drugs have ingredients of unknown origin
    and identity, as well as additives
       Sugar, starch, starch, quinine
   Two phases to identify drugs
     Color test- produce characteristics of most
      commonly used drugs
     Confirmation test – single test that identifies a
      substance
        Qualitative vs. Quantitative
   Qualitative
     Identity of a material
     Reveal presence of heroin and quinine

   Quantitative
     % combination of the components of a
      mixture
     Concludes that 10% heroin, 90% quinine
                      Color Tests
   Marquis – turns purple in
    presence of heroin,
    morphine
       Orange when mixed with
        amphetamines
   Dillie- Koppanyi-
    barbiturates turns violet-
    blue
   Duquenois Levine-
    marijuana, purple color
   Van Urk- blue purple in
    presence of LSD
   Scott Test – cocaine, blue
          Microcrystalline Tests
   Add a chemical reagent on a slide and
    after a short period of time crystals will
    appear
             Chromatography
   Separating and tentatively identifying the
    components of a mixture
         Spectrophotometry
 Study of the absorption of light by
  chemical substances
 Laboratories use ultraviolet UV and
  infrared (IR) to characterize chemical
  compounds

				
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