If the car doesn’t start, you are too drunk to drive. That is the premise behind a $600 sensor that can be installed in a steering wheel or in gloves and will test a driver’s skin to determine alcohol consumption. Inventor Dennis Bellehumeur, 54, says his device prevents a vehicle from starting or running if the driver is over the legal alcohol limit.The device’s skin sensor makes it different from the “breath alcohol ignition interlock” that has been on the market for three decades. That device requires that a driver blow into an instrument that measures alcohol in the breath.Bellehumeur, a real estate agent and deli owner in Wilton Manors, spent 12 years developing his sensor after his then-teenage son crashed into a utility pole while driving drunk and suffered minor brain damage.