How did the USA PATRIOT Act expand federal surveillance powers?

The USA PATRIOT Act significantly expanded federal surveillance powers by amending existing statutes to facilitate broader investigations into terrorism and criminal activity. Key expansions included:

• Eavesdropping and Records: The act added computer and terrorist crimes to the list of offenses eligible for court-ordered eavesdropping. It also allowed the government to obtain individual subscriber records, such as credit card and bank account numbers, via subpoena.1
• Surveillance Technology: Section 216 permitted the use of pen registers and trap-and-trace devices to monitor e-mail and Web browsing without requiring a showing of probable cause, needing only a certification of relevance to a criminal investigation.1
• FISA Modifications: Section 218 lowered the threshold for Foreign Intelligence Surveillance Court (FISC) warrants, requiring only that foreign intelligence collection be a significant purpose rather than the primary purpose. Section 215 granted authority to demand any tangible items from third parties, while Section 206 authorized "roving" surveillance.1
• Information Sharing and Secrecy: The act facilitated information sharing between law enforcement and intelligence agencies and authorized "sneak and peek" searches, which delay notification to the target. Additionally, it utilized gag orders to prevent third parties from disclosing government requests for information.1