I got arrested for DUI once for having an unlit joint under my seat. The cop kept commenting about how it smelled more than people he pulled over with pounds in the trunk, but it was just a small joint of DNA's Martian Kush. He didnt even confiscate it and told me to keep it in my pocket during processing at the station, and every single cop in the station was commenting on the smell.
Luckily, I was a legal medical patient but unluckily, I had to spend the next two years in court continuances fighting the case until they finally dropped it.