Given that the best way to store your car keys at night is by putting them in a coffee can, what's an ex-FBI agent's advice to protect cars from theft during the day? Wrap car fobs in aluminum foil.

Always-on key fobs present a severe weakness of your car's security. As long as your keys are in range, anyone can open the car, and the system will think it's you. That's why newer car models won't ...