This happens in some way in Australia. It's kind of good: you get notice when you throw out something they can't recycle/compost, and they threaten to stop collecting from you if you don't improve. It's kind of bad: I put litter in a black compostable bag instead of a green compostable bag and got a warning :-( When asked, they didn't care - use a green bag. Which means they probably don't notice green non-compostable ones.
