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Wikipedia on Tetrahydrocannabinol
Researchers at John Jay College of Criminal Justice reported that dietary zinc supplements can mask the presence of THC and other drugs in urine. The Duquenois–Levine test is commonly used as a screening test in the field (but it cannot definitively confirm the presence of cannabis), as a large range of substances have been shown to give false positives. It is unknown if or how these actions contribute to the effects of cannabis. (mehr …)