What if a person has smoked marijuana 3 or 4 days prior to being arrested and administered a blood test? Would it show on the test that the person is under the influence?
Gary Churak's Answer
It would probably read a low percentage of THC in your blood depending on how much you smoked. Usually, it will — Marijuana could stay in your system up to 30 days, it just depends on how much it’s showing in your system at the time that they’re running the blood test. There is a scale they use arbitrary as it is to make a determination of the level of intoxication.