It's a good idea, or is it? I don't think this law would overpower the law of private property. But in Poland everything's possible I guess.
I haven`t heard about it - but if it`s true - it`s a very good idea, cose it is going make people think twice before getting into a car after a few drinks.
btw. Though private property, forms the, so to say, the core of our Constitution - it is possible that during a war or martial law - your cars (especially SUVs) might be confiscated for defense pourpouses by the military - so confiscating a car for driving after a few drinks is not such a strange idea.