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Not necessarily so. People who are traveling do many other things beyond just driving, like purchasing meals and renting lodging. If done with a credit card, all of this leaves a remarkably clear paper trail, often with signed credit card slips along the way, which provide additional evidence to verify that a particular person was driving a particular vehicle at a given time.

Also, if the only evidence of a vehicle's driver's location is GPS data, other information about where that person was and who had access to her vehicle could be introduced to support or refute the assumption that she was driving the vehicle.

Finally, on the issue of GPS itself, I have it on my vehicle and it is uncannily accurate, usually within about 50 feet. Government agencies also consistently use it when the want to establish the accurate locations of buildings and other facilities. For example, the Tennessee Valley Authority, for which I worked before retiring, used and uses GPS fixes to locate and identify each of its many buildings for Federal energy reporting purposes.

My airplane uses GPS and I'm quite aware of it's use.

When I'm scud running and flying an unpublished approach into my airport, my transponder is turned off, thank you!

And yes....The credit cards, toll booth cameras, mini-mart gas purchases, and such go without saying.

That known, every technology can be thwarted with common sense and low-tech methods. The more and more law enforcement becomes dependant on such tactics, the easier it will be to beat them.

Imagine a task force trying to pin something on a suspect and they are trying to establish that he travelled from LA to Reno and back. They would merely review all the video tapes of gas stations along the routes. But what if the suspect kept a few Gerry Cans of gasoline in the vehicle, allowing him or her to go thousands of miles without a fill? Swap plates on a car randomly at a hospital or shift working business. Use them for a few days and then swap them back. Shift workers are useful. They won't even notice unless plates were just missing. They won't even notice changed numbers.

Any traffic cameras use plate numbers.

Use shot noise generators to trash any evesdropping devices or wireless transmissions. They cost a few bucks to make.

The same technology used to prosecute you can be turned around to cover-up for you. A strong defense can be mounted by using technology to exhonorate you if you know how to go about it.