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

608 views

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?

In: 459