Regarding the new DUID laws that will come into effect, the important thing to remember is to not give the popo any reason to pull you over in the first place. But if you do give them one, make damn sure that you don't give them any reason to suspect you of driving under the influence. In other words, if you and your car don't stink to high heaven, you don't drive like an asshole on the regular, and do proper vehicle inspections regularly, then you're probably gonna be just fine. however, if you don't know that you have a tail light out, and you're blazing it up as you drive, or even have some super stanky on you, then you might just be fucked. And yes, it's a blood test that they will perform in the field, and yes, it can fuck you, even if you haven't smoked in days or possibly even weeks. Don't let the new DUID laws stop you from having a good time, just be responsible about it. Kinda like alcohol.