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Yes. When you take a drug test they dont actually test for THC as you know it. They test for the metabolites of THC, these being THC-OH and THC-COOH. Depending on the level of each of these metabolites you can determine roughly how long it has been by comparing the amounts and doing some calculations using their known metabolic halflives. From the amount present of each, they can almost tell you how much of it you smoked as well.

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Q: Can a result value tell when the last use was for THC?
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