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
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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.