I know here in Michigan, if you refuse a request to search, they will detain you, (tell you to stay here) and then call in the dog. They will have the dog walk around the perimeter of your vehicle, alas, not violating your right to refuse a search. If the dog picks up a scent, they then have probable cause to search your vehicle, without your consent. NORML fails to inform you of this. I know, I've been there. You can not just leave the situation, if your pulled over, unless they tell you, to move along. You need to ask them, "Am I being arrested, or otherwise detained?" If they say no, then you are free to leave. But the police CAN detain you untill their dog arrives, and their dog picking up a scent is probable cause. Your best bet, is if you have weed on you, hide it well, and consent to a search, and hope your hiding spot is better then the cops ability to find things. If they call a dog, and you have weed, your busted 9 times out of 10. Course if you have no weed, and they want to serch tell them no. And make them call the dog for no reason. But this is only from my experiance here in Michigan. They are more concerned with pot then gang activity.