Exactly! That's why this kind of thing is covered in the Constitution. There's a footnote after the Bill of Rights that says, "all of the above may be thrown out to catch drug users, drunks, or terrorists." You just haven't seen the footnote because it's written in Captain Crunch invisible ink marker.
http://www.roadblock.org/registry.htm
~U.S. Constitution: Article [IV.] ~The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized. ~
One phone call from a governor or Att. Gen. and it will happen. Governor X to State Police commander " We have credible info from DHS that the evil constitution freeks and will be transporting firearms in preperation to attack local mosques. We want to set up saftey inspections on the primary roads"
State police commander to troop commanders " We have info that white males may be transporting guns on the highway we need to set up seat belt/DUI checkpoints to develop RS to search vehicles"
Trooper to Sgt. "Sir this is BS and illegal"
Sgt. to trooper "Well you can take you copy of the constitution and pay your morgtage with that"
Driver stopped at checkpoint to JBT: "No I do not consent to having my car searched"
JBT: "If you have nothing to hide than you have nothing to worry about"
Driver:"Am I under arrest?"
JBT: "No you are being detained"
JBT: "Where are you going to and where did you come from?"
Driver:"I refuse to answer your questions"
JBT:"Step out of the car"
Driver:"Am I under arrest, what for?"
JBT:"Get the F@#$ out of the car"
Driver:"Am I under a......" As tazer crackles
its written on the back, next to the National Treasure map.