The Colorado DOT website about their DUI blood test for THC:
I thought people knew you can NOT determine if a person is impaired by marijuana through a blood test?!!
Imagine someone coming home from graduating college, they are more of a social toker but smoking at least a few times a week. The family throws a party for them and their way of celebrating is to smoke a large spliff, lets say for arguments sake that this all takes place after Question 1 passed on a Friday night.
On the way home Monday they get pulled over (they had a light out). The officer in question happens to see a bowl and a gram of weed, it is legal so whats the harm, why hide it?
Because they didn’t know that its illegal to have marijuana in the passenger area of a vehicle if it is in an open container, or a container with a broken seal. A broken seal, really?! What if its kept in a zip lock bag or some other re-sealable? Anyway, it gives them the right to order a blood test and since they smoke a few time a week and just had a big spliff Friday guess what, they are going to fail that blood test even though they hadn’t been smoking at that time!
“Unlike alcohol, for which impairment can be reasonably measured using a breathalyzer (and confirmed with a blood alcohol content measurement), valid detection for cannabis is time-consuming, and tests cannot determine an approximate degree of impairment. The lack of suitable tests and agreed-upon intoxication levels is an issue in the legality of cannabis debate, especially regarding intoxicated driving.”