Well, not yet, but maybe soon, coming to a neighbourhood near you.
next..........random searches for "drugs"
or.............random body cavity searches.
Nothing like freedom.
I dont think they will come to your door and ask you to "blow" they can find all kind of excuses to give you a breath test anyways while your driving,this is just giving them more clout in court for a conviction.
They can search you for anything if they have probable cause to do so,like a roach burning in the ashtray,or a beer between your knees.
This reminds me of a ukranian joke where a cop pulls over a gal and pulls out his package and she says "oh no! not another breathalizer".