If you live in Virginia and owe back property taxes, you should probably leave your car parked in the garage. That's because a few local police departments and towns are now using license plate readers provided by the Department of Homeland Security to spot people who owe back taxes and then impound their vehicles. Multiple agencies across the state were able to purchase automatic license plate readers thanks to grant money they received from Homeland Security's terrorism prevention program. But, rather than use them for security purposes, some seem to be using them to fill local coffers by collecting taxes.