United States Signals Intelligence Directive
SP0018
(U) LEGAL COMPLIANCE AND U.S. PERSONS MINIMIZATION PROCEDURES
(U) USSID SP0018 prescribes policies and procedures and assigns responsibilities to ensure that the missions and functions of the United States SIGINT System (USSS) are conducted in a manner that safeguards the constitutional rights of U.S. persons. This USSID delineates and promulgates the USSS minimization policy and procedures required to protect the privacy of U.S. persons.