I'm amazed how many people misinterpret Printz. Nothing in Printz says what people say it says and then they offer quotes as evidence that clearly don't say what people are claiming the quote says.
In Printz, the Supreme Court said that the federal government cannot force states to do work without paying for that work. It also states that the Constitution reserves unenumerated powers to the states or the people (which is what the Constitution says). Nowhere does the Court suggest that unemerated powers are reserved to the county sheriff.
I wish it were so, folks. I really do. But it ain't.