https://en.wikipedia.org/wiki/USA_PATRIOT_Act
https://en.wikipedia.org/wiki/USA_PATRIOT_Act_controversy
https://www.slate.com/id/2087984/
https://www.aclu.org//safefree/patriot/16760prs20030826.html
"Section 215 modifies the rules on records searches. Post-Patriot Act, third-party holders of your financial, library, travel, video rental, phone, medical, church, synagogue, and mosque records can be searched without your knowledge or consent, providing the government says it's trying to protect against terrorism."
This includes demanding that libraries hand over lists of everyone who checked out certain books, on demand, without ever informing you in any way, AND WITH NO WARRANT.
In other words, law enforcement officials now have the power to investigate you in great detail, seizing information without warrants and without ever even informing you. PROBABLE CAUSE no longer exists as long as they claim that the investigation is "relevant" to an investigation that has to do with terrorism. They don't have to think YOU'RE a terrorist, they just have to think that seizing your information is somehow relevant to a terrorist investigation. Probable cause is what the CONSTITUTION demands, but the Patriot Act throws it out the window.
Law enforcement can now seize property through the use of secret warrants and not have to tell you about it.
This is just the start of it.... it's really f***ed up.