Drug chemistry
The scientists in the Drug Chemistry Section analyze items of evidence submitted by law enforcement for the presence or absence of controlled substances. Drug evidence may be in the form of plant material (such as cannabis, synthetic cannabinoids, salvia and khat), solids (such as methamphetamine, powder cocaine, crack cocaine and pharmaceutical or clandestine tablets) or liquids (such as clandestine laboratory samples).
When evidence is submitted to the Drug Chemistry Section, an initial physical examination is performed. This physical examination includes examining packaging for seals and a macroscopic examination of the evidence. After initial observations are noted (including a weight, volume or unit count), a Drug Chemist typically screens the evidence using chemical spot tests or instrumentation or both. After screening, the scientists in the Drug Chemistry Section use a variety of extractions and instrumentation to confirm the presence or absence of controlled substances as indicated by the preliminary screening tests. Once all examinations are completed, a report is written.
Reports routinely include an amount determination (such as grams or units) with uncertainty of measurement and a qualitative identification of any controlled substances identified. For federally prosecuted methamphetamine cases, we will also perform quantitative examinations to determine the concentration of methamphetamine.
Scientists also provide expert testimony in both state and federal courts. The Drug Chemistry Section is also a resource for controlled substance information for the courts and other state agencies.
