National Security Letter

Category Abbreviation:

LNSL

Category Description:

Related to administrative orders sent to compel the recipients of the letters to provide information to federal investigators. A national security letter (NSL) is a law enforcement investigative tool similar to a subpoena and is most commonly issued by the FBI. NSLs are used to obtain information from companies as part of national security-related investigations.

Required Warning Statement:

Required Dissemination Control:

Examples

Contents of the order
Recipient's personal information

Authorities

50 USC 3162(b)