Fuck no they aren't going to get a warrant for your house if they just caught you with 12 g's in a parking lot.. Unless you had a bunch of grow equipment in your car you have nothing to worry about. That shit will probably be like a $150 possession ticket if you don't have any priors.. A little tip, never park and smoke.. Try to never even have to smoke in a car if you don't have too. It's basically one of the only ways you can get busted smoking, unless you have absolutely no respect for the law.. Never roll with anything you can't swallow in like 3 seconds, and you'll stay out of the big house..