July 27, 1993 United States Signals Intelligence Directive 18
Document Date:
July 27, 1993
Release Date: November 18, 2013
Agency:
Government (ACLU/EFF FOIA Litigation)
Document Type:
Internal NSA/DOJ Legal Analysis
Legal Authorities:
FISA Amendments Act, Executive Order 12333
United States Intelligence Directive 18 (USSID 18) prescribing NSA policies and procedures as they relate to the Fourth Amendment of the Constitution and minimization procedures/rules governing the collection, retention, and dissemination of information about US persons.