HOW TO SOLVE DRUNK DRIVING – I have long advocated that we can solve the plague of drinking and driving if we have the collective social will to do so. Equip every new vehicle with an integrated ignition interlock type device. The scale of quantity will reduce the price, insurance risk will be reduced and it will become another safety device like seatbelts.

According to the Globe & Mail:

There are two layers to DADSS (Drive Alcohol Detection System for Safety program) that could someday find their ways into vehicles. Both would be designed to prevent cars from turning on when the driver’s blood alcohol content is at or above 0.08 per cent, which is the limit in many U.S. states. The mechanisms are passive, meaning a driver wouldn’t need to breathe into a special device just to turn on their car.
 
Instead, DADDS tech proposes checking a driver’s breath through sensors in the cabin that use infrared light beams to measure alcohol levels. Proposed sensor locations include the steering column and driver-side door – placed in such a way that other passengers’ breath wouldn’t affect the measurements. A second proposal would use non-invasive touch sensors, possibly on ignition buttons or on the gear shift, to measure alcohol levels in the blood beneath the skin.