Just like practically anything, people will abuse this... but I think this is a decent idea.
Sometimes people don't realize how much they've had to drink. They may "feel" alright, but they could be a checkstop away from a world of hurt, or a turn away from a deadly collision.
Now what they should have is a mandatory breathalizer (with fingerprint scanners) on all vehicles. If you blow over, the car won't start.
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