Discussion
A suspect is caught 30 days after he committed a murder under the influence of drugs. Analysis of which matrix of suspect is most likely to identify the drug :
Answer: B
After 30 days the drug is most likely to be found in hair.
Drugs in the bloodstream are incorporated into the hair as it grows, at roughly 1 cm a month, and stay there. Hair therefore gives a long window of detection, months rather than days, and segmental analysis can even show roughly when the drug was used.
Blood and saliva detect most drugs only for hours to a day or two after use, and sweat, collected with patches, covers about a week of wear. A month after the crime, none of them would reliably show the drug.
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