The police collected a white powder from a suspected drug dealer and sent it to your laboratory for testing. You, a forensic toxicologist at the laboratory, were called to testify that this substance was identified as cocaine. Briefly (in several paragraphs) address each of the following questions:
What sort of evidence would you present if the defense attorney suggested that the sample you analyzed was not the sample seized by the police?
Suppose the sample was analyzed by GCMS. What sort of information would you give the jury about the analytical method? How would you demonstrate that you did not have a false positive result?
What, if anything, would you change in the analytical method if you were examining the defendant's urine rather than the powder for cocaine?
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1 Custodian certificate issued by authorized customs personnel (signed and stamped) as per the Narcotics and Psychotropic Substances Act, that states the details and amount of material recovered from the accused must be produced.
2 Test license for the seized material as it is under the control by authorized person and the consumption record for the respective analysis.
3 Attested Certificate of Analysis (CoA) for the given sample as per the monograph (Official compendium).
4 Documented evidence that the seized sample was stored under lock & key from the time of seizure to time of analysis, preserving the stability (stored under prescribed storage conditions) where the key resides only with the Authorized personnel....
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