An Arizona Court of Appeals has taken the position that it is legal to give drivers a DUI if they ingested marijuana weeks earlier. Police can use blood tests to test for marijuana and 'its metabolite,' which can remain detectable in the body for around 4 weeks, and holds no bearing on intoxication.
Arizona court ruling upholds DUI blood test for marijuana and 'its metabolite' | OregonLive.com
Arizona court ruling upholds DUI blood test for marijuana and 'its metabolite' | OregonLive.com