Fleurdelys why don't you go and ask the truck and train driver's union if they would agree to have gadgets installed in their truck cabs that would record and monitor everything they do and everything they say? That would mostly be used for safety enhancement purposes, and only on very special occasions would we allow the cops to use them as evidence against you in court
I suspect you'd get run out of the truckstop by a bunch of very angry truckers before you could say "but the pilots agreed to it!"