Indeed the wording is vague, and the response to a positive sensor detection is not specified at all. So maybe it’s premature to worry too much about the amount of damage it might do, since we don’t even know what it will do, and it hasn’t passed yet?

Do you think the goal is worth pursuing? Imagine we could achieve zero false positives, would you be in favor of it then? Would it depend on what the system does with a positive detection? If we could have perfect detection of drink driving, should we? Or, said another way, should it be anyone’s right to choose whether they drive drunk?

It’s worth remembering that it was argued that mandatory seatbelts were also terrible overreach, as well as other mandatory safety measures like airbags, child seats, mandatory motorcycle helmets, etc, despite the fact that the safety results are unequivocally positive. It seems like in the US we tend to have a problem with things that are mandatory, regardless of the benefits or outcomes.