10 U.S. Code § 7377 - Civilian special agents of the Criminal Investigation Command: authority to execute warrants and make arrests
The Secretary of the Army may authorize any Department of the Army civilian employee described in subsection (b) to have the same authority to execute and serve warrants and other processes issued under the authority of the United States and to make arrests without a warrant as may be authorized under section 1585a of this title for special agents of the Defense Criminal Investigative Service.
(b) Agents To Have Authority.—
Subsection (a) applies to any employee of the Department of the Army who is a special agent of the Army Criminal Investigation Command (or a successor to that command) whose duties include conducting, supervising, or coordinating investigations of criminal activity in programs and operations of the Department of the Army.
(c) Guidelines for Exercise of Authority.—
The authority provided under subsection (a) shall be exercised in accordance with guidelines prescribed by the Secretary of the Army and approved by the Secretary of Defense and the Attorney General and any other applicable guidelines prescribed by the Secretary of the Army, the Secretary of Defense, or the Attorney General.