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Thing is, a blood test can detect pot days after it's ingested, when the person is not impaired at all.

I wouldn't be too sure. Like blood alcohol, depends on the level. Below is a link to the fist paper I've seen to establish a serum level and impairment, 2-5 ng/ml.

Read another paper that showed combining THC and alcohol is worse than either alone.

Doesn't matter how long ago one used, if its still floating around in the system it can still have an effect.

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