With all the stuff in the news recently about using US Citizens as mules crossing with drugs, and some of the stories that you hear about where someone has taped packages of drugs to the underside of cars crossing north (without the car owners' knowledge), is there anyway to check for that before crossing? I realize you can just look at the undercarriage of your vehicle, but what if someone has hidden something so high up in there that you can't see it just with a flashlight from under the car. How would you protect yourself from that?