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Ch 23.doc

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Forensic Science
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FSC239thDecember 14Ch 23pgs 457 to 482 Analysis of Control Substancescontrolled substances substances usually drugs whose possession or use is regulated by the governmentthe analysis of controlled substances is the basis of the forensic laboratoryoto confirm the presence of a substance that is either statutorily regulated or is illegal to possessesdeductive reasoning using nonspecific details to infer a specific factofrom general to specificbuild downStandard Practices currently under development by the ASTM E30 are1WK389 Terminology relating to forensic seized drug analysis2WK390 Practice for identification of drugs3WK2238 Standard terminology relating to seized drug analysis 4WW2239 Standard practice of education and training of seized drug analysis5WW2240 Standard practice for quality assurance of laboratories performing seized drug analysis 6WW2241 Standard practice for identification of seized drugsSWGDRUG has established 3 categories of analytical techniqueso1 Category Cnonspecific techniqueso2 Category Bmoderately specific techniqueso3 Category Aspecific techniquesthe SWGDRUG guidelines provide recommendations for the types and minimum number of tests required to identify seized drugsminimum examination criteria is a validated Category A supported by a Category ABC techniquethe examination of controlled substances is divided intoobotanical examinations identify physical characteristics specific to plantsmost commondone at the controlled substance section of labex marijuana peyote mushrooms and opiumexaminer is identifying plant material not specific psychoactive ingredientsDNA analysis has potential applicationsochemical examinations use wet chemical or instrumental techniques to identify specific substances that are controlled by statuteMarijuanacannabis sativa lidentification is a 2step processo1 establishes plantplant material as mj through physical characteristicsidentification process begins with macroscopic examination of plant material 1has palmate leaf configuration and pinnate leaf structure with serrated edgesmicroscopic identification is used to identifycystolithicbear claw shapedhairs on the top surface of the leaf
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