[elkfersupper]

Government should have the ability to punish a person for endangering others; whether that fits your category of "punish[ing] a person for a 'crime' before it has been committed" is your call.

Undercover cops are arresting people in bars in VA, NM, and TX because they "might" drive later.

I suppose you like that as well.

I can't wait until they start arresting fat people at those combination gas station / c-store / franchised fast food joints because they "might" eat a Big Mac.

[Know your rights]

Undercover cops are arresting people in bars in VA, NM, and TX because they "might" drive later.

I suppose you like that as well.

You suppose wrong; being drunk (or high) is not in and of itself a danger to anyone else, and hence is none of government's business. Being impaired while driving is a danger to others, and may properly be banned.