eli5: why is there not a “blood THC concentration” test to determine if someone is intoxicated/impaired right now?

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Urine THC testing will return a positive result if the donor has used THC sometime recently, but not necessarily that they’re inebriated right now, whereas BAC tests can determine if someone is intoxicated at the time of the test. Is there a reason we don’t have “you are high right now” tests instead of “you smoked 2 weeks ago” tests?

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Anonymous 0 Comments

Specific blood/THC concentrations simply do not predict specific cognitive impairments with sufficient accuracy to justify prosecution and conviction as is done with alcohol.

This fact doesn’t stop jurisdictions from proscribing their own limits anyways and convicting people who exceed them, despite the fact that such limits are meaningless.

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