There have been instances where the USA PATRIOT Act has been used against individuals to see what books they've checked out at libraries and what they might have done on library computers. This was an issue that was addressed early on in the Acts debate and it just so happened to be one that the government had acted on. Seems like you might have been asleep at the wheel.
Features - The USA PATRIOT Act and Patron Privacy on Library Internet Terminals | LLRX.com
The Patriot Act and Civil Liberties | US Opinion and Editorial Right Side News
Had to be approved by a judge:
Section summary of the USA PATRIOT Act, Title II - Wikipedia, the free encyclopedia