Where is NCIS authority codified?
The authority of the NCIS is found in SECNAV (Secretary of the Navy) Instruction 5430.107, which states that NCIS has primary investigative and counterintelligence jurisdiction within the Department of the Navy. NCIS’ jurisdiction is grounded and documented in Presidential Executive Order, as well as several Department of Defense and Secretary of the Navy instructions noted in SECNAV Instruction 5430.107.