National Security Letters (NSLs) are an extraordinary search procedure which gives the FBI the power to compel the disclosure of customer records held by banks, telephone companies, Internet Service Providers, and others. These entities are prohibited, or "gagged," from telling anyone about their receipt of the NSL, which makes oversight difficult. The Number of NSLs issued has grown dramatically since the Patriot Act expanded the FBI's authority to issue them.
I believe the use of the term, "search warrant" is a misnomer.
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