Originally Posted by Roy2CDG

For example, I drove to Toronto not too long ago. I stayed at a hotel where my car was parked by the valet in the hotel garage. Someone at the hotel obviously know when I'm checking out. Since my car had US license plate, it's probably safe to assume that I would be driving back to the US. A drug dealer could have gained access to my car and stuffed pot in my trunk or in the spare tire. I would then drive across the border completely unaware of the illegal items in my car.