32 CFR 182.4 - Policy.
It is DoD policy that:
(a) The Department of Defense shall be prepared to support civilian law enforcement agencies consistent with the needs of military preparedness of the United States, while recognizing and conforming to the legal limitations on direct DoD involvement in civilian law enforcement activities.
(b) Support of civilian law enforcement agencies by DoD personnel shall be provided in accordance with 18 U.S.C. 112, 351, 831, 1116, 1751, and 1385 (also known and hereinafter referred to as “The Posse Comitatus Act, as amended”); 10 U.S.C. chapter 18; 2 U.S.C. 1970 (for support to the U.S. Capitol Police); and other Federal laws, including those protecting the civil rights and civil liberties of individuals, as applicable.
(d) Exceptions, based on compelling and extraordinary circumstances, may be granted to the restrictions in § 182.6(a)(1)(iii) for assistance to be provided outside the United States; only the Secretary of Defense or Deputy Secretary of Defense may grant such exceptions.
(e) Requests for law enforcement support shall be evaluated using the criteria in 32 CFR part 185.