gollum123 writes to mention a CNN article, reporting on an FBI information release.
The number of secret subpoenas the Bureau filed last year reached 3,501. These documents allowed access to credit card records, bank statements, telephone records, and internet access logs for thousands of legal citizens without asking for a court's permission. From the article:
"The Foreign Intelligence Surveillance Court, the same panel that signs off on applications for business records warrants, also approved 2,072 special warrants last year for secret wiretaps and searches of suspected terrorists and spies. The record number is more than twice as many as were issued in 2000, the last full year before the terrorist attacks of September 11, 2001."