Detection of cannabis consumption:
Can the use of cannabis be detected in blood or urine with routinely laboratory tests?
Answers:
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Franjo Grotenhermen
The use of cannabis or THC in blood, urine or other body fluids can only be detected through specific search for THC or its metabolites. The search for THC or its metabolites is not a usal part of routinely blood or urine tests performed in a medical practice or in a hospital.
