Increasingly courts have no problem with police placing a tracking device on a car that records your every movement without any constitutional protections such as a warrant. If it's true that one should have no expectation of privacy when on public roads, then there is no problem with the government knowing your every move at all times. This is the direction in which we are headed.

When Robert Moran drove back to his law offices in Rome, N.Y., after a plane trip to Arizona in July 2003, he had no idea that a silent stowaway was aboard his vehicle: a secret GPS bug implanted without a court order by state police.