The actual law says that all cars after a certain date should have a system that can:<p>"passively monitor the performance of a driver of a motor vehicle to accurately identify whether that driver may be impaired; and prevent or limit motor vehicle operation if an impairment is detected"<p>There is an OR for detecting high blood alcohol level.<p>There are a few years to get input, come up with preliminary rules, get more input, finalize the rules and give time for manufacturers to implement them.<p>This could save 10,000 lives per year and tens of billions of dollars per year.<p>The law says "prevent or limit operation". That is pretty broad.<p>If it is a breathalyzer, or a speed limiter when you are swerving over a 2 minute period, I am fine with that.<p>If it shuts you down for going over the speed limit for 10 seconds, or make an emergency maneuver, then I am not so happy. But that is why we have a representative form of government, and input on regulations.