NORFOLK -- The repo man may be getting the hook. An electronic device that attaches to a car's ignition system easily can take the place of a tow-truck repossession, and the units are finding their way onto high-risk car lots across the country. No pay, no start. It's worked wonders at Norfolk's Patriot Auto Sales, where nearly every car that is driven off the lot is outfitted with a PayTeck Smart Box, a system that hands over a five-digit code in exchange for each payment. Come due date, the car won't crank until the customer punches the code into a...