In the USA, the various DMVs (the people who handle licensing of vehicles) sell their databases to companies for marketing. In California, your fingerprint is taken when you get your drivers license. Since there's no way to 'opt out' from the marketing data sale, I'm concerned that electronic copies of my fingerprint would be floating around as a result of this sale. While it might not mean anything today with current technology, there's no reason it might not be valuable/useful to the wrong people five or ten years from now.
I hate the idea of adding new laws, but in lieu of having ways to control how companies/government use your personal data.... it bears consideration.