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

It stays in your body for so long, like days or weeks long. I’m a daily user so I’d have to stop for over a month before all the THC left my body. That’s why the tests aren’t considered accurate and so many people disagree with them. Someone could test positive for THC even if they consumed it a week ago. And most highs only last a few hours. You also can’t go off of observable external signals, like stumbling around or slow speech, because some people are just like that normally. How do you know if they’re high or just have a learning disability? Is this person acting shifty because they have weed paranoia, or do they have an anxiety disorder? There’s really no way of knowing unless you have access to medical records/history. And in my opinion, it shouldn’t matter what someone does in their free time as long as it isn’t impacting their work. Lots of people go home after work and drink themselves into a coma only to repeat the process the next day, but we don’t test alcoholics before hiring them. Partially because you really can’t test for that, but also we tend to view alcohol as a more socially-acceptable drug. In some circles, not drinking can actually exclude you from certain social activities. It’s just crazy to me how we draw lines with this stuff.

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