Quote Originally Posted by jagarr
you can't be arrested unless you fail sobriety tests and/or you have something illegal on you or in your vehicle. you definitely can't be arrested because your car 'smells like pot.
That's not very accurate because you can be arrested even if you refuse field sobriety tests and don't give any samples. A smell of marijuana in the car can easily lead to being arrested for driving while under the influence.

If your body was totally clean and you smoked, it usually takes 4-8 hours for the metabolites to appear in urine. It can be as quick as 2 hours though.