Well, current-gen tech is. But an AI/camera based version that quickly checks your pupil dilation when you put the engine in gear could work just fine. It could also catch drugs other than alcohol.
Or you could do near-infrared spectroscopy built into the gear lever (this is already being pushed by the NHTSA, and will probably be in cars in a few years).
Or it could even have a selective alcohol-lock using current-gen tech that only triggers a check if alcohol is detected in the air circulating in the car.
Or you could do near-infrared spectroscopy built into the gear lever (this is already being pushed by the NHTSA, and will probably be in cars in a few years).
Or it could even have a selective alcohol-lock using current-gen tech that only triggers a check if alcohol is detected in the air circulating in the car.