Statutory Law - US Code - Title 10: Armed Forces


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U.S. Code Title 10: Armed Forces


Chapter 18: Military Support for Civilian Law Enforcement Agencies

*Current through Public Law 112-173, August 16th, 2012.
**Selected Provisions Relevant to U.S. Intelligence Law

CHAPTER 18—MILITARY SUPPORT FOR CIVILIAN LAW ENFORCEMENT AGENCIES

10 USC § 371. Use of information collected during military operations

(a) The Secretary of Defense may, in accordance with other applicable law, provide to Federal, State, or local civilian law enforcement officials any information collected during the normal course of military training or operations that may be relevant to a violation of any Federal or State law within the jurisdiction of such officials.
(b) The needs of civilian law enforcement officials for information shall, to the maximum extent practicable, be taken into account in the planning and execution of military training or operations.
(c) The Secretary of Defense shall ensure, to the extent consistent with national security, that intelligence information held by the Department of Defense and relevant to drug interdiction or other civilian law enforcement matters is provided promptly to appropriate civilian law enforcement officials.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1115; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2043.)
Short Title of 1986 Amendment
Pub. L. 99–570, title III, §3051, Oct. 27, 1986, 100 Stat. 3207–74, provided that: “This subtitle [subtitle A (§§3051–3059) of title III of Pub. L. 99–570, enacting section 379 of this title, amending sections 374 and 911 of this title, enacting provisions set out as notes under sections 374, 525, and 9441 of this title, and repealing provisions set out as a note under section 89 of Title 14, Coast Guard] may be cited as the ‘Defense Drug Interdiction Assistance Act’.”
Authority for Joint Task Forces to Provide Support to Law Enforcement Agencies Conducting Counter-Terrorism Activities
Pub. L. 108–136, div. A, title X, §1022, Nov. 24, 2003, 117 Stat. 1594, as amended by Pub. L. 109–163, div. A, title X, §1022, Jan. 6, 2006, 119 Stat. 3427; Pub. L. 110–181, div. A, title X, §1021, Jan. 28, 2008, 122 Stat. 304; Pub. L. 110–417, [div. A], title X, §1022, Oct. 14, 2008, 122 Stat. 4586; Pub. L. 111–84, div. A, title X, §1012, Oct. 28, 2009, 123 Stat. 2441; Pub. L. 111–383, div. A, title X, §1012(a)–(b)(2), Jan. 7, 2011, 124 Stat. 4346, 4347; Pub. L. 112–81, div. A, title X, §1004(a), Dec. 31, 2011, 125 Stat. 1556, provided that:
“(a) Authority.—A joint task force of the Department of Defense that provides support to law enforcement agencies conducting counter-drug activities may also provide, subject to all applicable laws and regulations, support to law enforcement agencies conducting counter-terrorism activities.
“(b) Availability of Funds.—During fiscal years 2006 through 2012, funds available to a joint task force to support counter-drug activities may also be used to provide the counter-terrorism support authorized by subsection (a).
“(c) Annual Report.—Not later than December 31 of each year after 2008 in which the authority in subsection (a) is in effect, the Secretary of Defense shall submit to Congress a report setting forth, for the one-year period ending on the date of such report, the following:
“(1) An assessment of the effect on counter-drug and counter-terrorism activities and objectives of using counter-drug funds of a joint task force to provide counterterrorism support authorized by subsection (a).
“(2) A description of the type of support and any recipient of support provided under subsection (a).
“(3) A list of current joint task forces conducting counter-drug operations.
“(4) A certification by the Secretary of Defense that any support provided under subsection (a) during such one-year period was provided in compliance with the requirements of subsection (d).
“(d) Conditions.—(1) Any support provided under subsection (a) may only be provided in the geographic area of responsibility of the joint task force.
“(2)(A) Support for counter-terrorism activities provided under subsection (a) may only be provided if the Secretary of Defense determines that the objectives of using the counter-drug funds of any joint task force to provide such support relate significantly to the objectives of providing support for counter-drug activities by that joint task force or any other joint task force.
“(B) The Secretary of Defense may waive the requirements of subparagraph (A) if the Secretary determines that such a waiver is vital to the national security interests of the United States. The Secretary shall promptly submit to Congress notice in writing of any waiver issued under this subparagraph.
“(C) The Secretary of Defense may delegate any responsibility of the Secretary under subparagraph (B) to the Deputy Secretary of Defense or to the Under Secretary of Defense for Policy. Except as provided in the preceding sentence, such a responsibility may not be delegated to any official of the Department of Defense or any other official.”
[Pub. L. 112–81, div. A, title X, §1004(b), Dec. 31, 2011, 125 Stat. 1556, provided that: “The authority in section 1022 of the National Defense Authorization Act for Fiscal Year 2004 [Pub. L. 108–136, set out above], as amended by subsection (a), may not be exercised unless the Secretary of Defense certifies to Congress, in writing, that the Department of Defense is in compliance with the provisions of paragraph (2) of subsection (d) of such section, as added by section 1012(b) of the Ike Skelton National Defense Authorization Act for Fiscal Year 2011 (Public Law 111–383; 124 Stat. 4346).”]

10 USC § 372. Use of military equipment and facilities

(a) In General.—The Secretary of Defense may, in accordance with other applicable law, make available any equipment (including associated supplies or spare parts), base facility, or research facility of the Department of Defense to any Federal, State, or local civilian law enforcement official for law enforcement purposes.
(b) Emergencies Involving Chemical and Biological Agents.—(1) In addition to equipment and facilities described in subsection (a), the Secretary may provide an item referred to in paragraph (2) to a Federal, State, or local law enforcement or emergency response agency to prepare for or respond to an emergency involving chemical or biological agents if the Secretary determines that the item is not reasonably available from another source. The requirement for a determination that an item is not reasonably available from another source does not apply to assistance provided under section 382 of this title pursuant to a request of the Attorney General for the assistance.
(2) An item referred to in paragraph (1) is any material or expertise of the Department of Defense appropriate for use in preparing for or responding to an emergency involving chemical or biological agents, including the following:
(A) Training facilities.
(B) Sensors.
(C) Protective clothing.
(D) Antidotes.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1115; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2043; Pub. L. 104–106, div. A, title III, §378, Feb. 10, 1996, 110 Stat. 284; Pub. L. 104–201, div. A, title XIV, §1416(b), Sept. 23, 1996, 110 Stat. 2723.)

10 USC § 373. Training and advising civilian law enforcement officials

The Secretary of Defense may, in accordance with other applicable law, make Department of Defense personnel available—
(1) to train Federal, State, and local civilian law enforcement officials in the operation and maintenance of equipment, including equipment made available under section 372 of this title; and
(2) to provide such law enforcement officials with expert advice relevant to the purposes of this chapter.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1115; amended Pub. L. 99–145, title XIV, §1423(a), Nov. 8, 1985, 99 Stat. 752; Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2043.)

10 USC § 374. Maintenance and operation of equipment

(a) The Secretary of Defense may, in accordance with other applicable law, make Department of Defense personnel available for the maintenance of equipment for Federal, State, and local civilian law enforcement officials, including equipment made available under section 372 of this title.
(b)(1) Subject to paragraph (2) and in accordance with other applicable law, the Secretary of Defense may, upon request from the head of a Federal law enforcement agency, make Department of Defense personnel available to operate equipment (including equipment made available under section 372 of this title) with respect to—
(A) a criminal violation of a provision of law specified in paragraph (4)(A);
(B) assistance that such agency is authorized to furnish to a State, local, or foreign government which is involved in the enforcement of similar laws;
(C) a foreign or domestic counter-terrorism operation; or
(D) a rendition of a suspected terrorist from a foreign country to the United States to stand trial.

(2) Department of Defense personnel made available to a civilian law enforcement agency under this subsection may operate equipment for the following purposes:
(A) Detection, monitoring, and communication of the movement of air and sea traffic.
(B) Detection, monitoring, and communication of the movement of surface traffic outside of the geographic boundary of the United States and within the United States not to exceed 25 miles of the boundary if the initial detection occurred outside of the boundary.
(C) Aerial reconnaissance.
(D) Interception of vessels or aircraft detected outside the land area of the United States for the purposes of communicating with such vessels and aircraft to direct such vessels and aircraft to go to a location designated by appropriate civilian officials.
(E) Operation of equipment to facilitate communications in connection with law enforcement programs specified in paragraph (4)(A).
(F) Subject to joint approval by the Secretary of Defense and the Attorney General (and the Secretary of State in the case of a law enforcement operation outside of the land area of the United States)—
(i) the transportation of civilian law enforcement personnel along with any other civilian or military personnel who are supporting, or conducting, a joint operation with civilian law enforcement personnel;
(ii) the operation of a base of operations for civilian law enforcement and supporting personnel; and
(iii) the transportation of suspected terrorists from foreign countries to the United States for trial (so long as the requesting Federal law enforcement agency provides all security for such transportation and maintains custody over the suspect through the duration of the transportation).

(3) Department of Defense personnel made available to operate equipment for the purpose stated in paragraph (2)(D) may continue to operate such equipment into the land area of the United States in cases involving the pursuit of vessels or aircraft where the detection began outside such land area.
(4) In this subsection:
(A) The term “Federal law enforcement agency” means a Federal agency with jurisdiction to enforce any of the following:
(i) The Controlled Substances Act (21 U.S.C. 801 et seq.) or the Controlled Substances Import and Export Act (21 U.S.C. 951 et seq.).
(ii) Any of sections 274 through 278 of the Immigration and Nationality Act (8 U.S.C. 1324–1328).
(iii) A law relating to the arrival or departure of merchandise (as defined in section 401 of the Tariff Act of 1930 (19 U.S.C. 1401) into or out of the customs territory of the United States (as defined in general note 2 of the Harmonized Tariff Schedule of the United States) or any other territory or possession of the United States.
(iv) Chapter 705 of title 46.
(v) Any law, foreign or domestic, prohibiting terrorist activities.

(B) The term “land area of the United States” includes the land area of any territory, commonwealth, or possession of the United States.

(c) The Secretary of Defense may, in accordance with other applicable law, make Department of Defense personnel available to any Federal, State, or local civilian law enforcement agency to operate equipment for purposes other than described in subsection (b)(2) only to the extent that such support does not involve direct participation by such personnel in a civilian law enforcement operation unless such direct participation is otherwise authorized by law.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1115; amended Pub. L. 98–525, title XIV, §1405(9), Oct. 19, 1984, 98 Stat. 2622; Pub. L. 99–570, title III, §3056, Oct. 27, 1986, 100 Stat. 3207–77; Pub. L. 99–661, div. A, title XIII, §1373(c), Nov. 14, 1986, 100 Stat. 4007; Pub. L. 100–418, title I, §1214(a)(1), Aug. 23, 1988, 102 Stat. 1155; Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2043; Pub. L. 101–189, div. A, title XII, §§1210, 1216(b), (c), Nov. 29, 1989, 103 Stat. 1566, 1569; Pub. L. 102–484, div. A, title X, §1042, Oct. 23, 1992, 106 Stat. 2492; Pub. L. 105–277, div. B, title II, §201, Oct. 21, 1998, 112 Stat. 2681–567; Pub. L. 106–65, div. A, title X, §1066(a)(4), Oct. 5, 1999, 113 Stat. 770; Pub. L. 109–304, §17(a)(1), Oct. 6, 2006, 120 Stat. 1706.)
Communications Network
Pub. L. 100–456, div. A, title XI, §1103, Sept. 29, 1988, 102 Stat. 2042, related to integration of United States assets dedicated to interdiction of illegal drugs into an effective communications network, prior to repeal by Pub. L. 101–189, div. A, title XII, §1204(b), Nov. 29, 1989, 103 Stat. 1564. See section 1204(a) of Pub. L. 101–189 set out as a note under section 124 of this title.

10 USC § 375. Restriction on direct participation by military personnel

The Secretary of Defense shall prescribe such regulations as may be necessary to ensure that any activity (including the provision of any equipment or facility or the assignment or detail of any personnel) under this chapter does not include or permit direct participation by a member of the Army, Navy, Air Force, or Marine Corps in a search, seizure, arrest, or other similar activity unless participation in such activity by such member is otherwise authorized by law.
(Added Pub. L. 97–86, title IX §905(a)(1), Dec. 1, 1981, 95 Stat. 1116; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2045; Pub. L. 101–189, div. A, title XII, §1211, Nov. 29, 1989, 103 Stat. 1567.)
Amendments
1989—Pub. L. 101–189 substituted “any activity” for “the provision of any support”, struck out “to any civilian law enforcement official” after “any personnel)”, and substituted “a search, seizure, arrest,” for “a search and seizure, an arrest,”.
1988—Pub. L. 100–456 amended section generally. Prior to amendment, section read as follows: “The Secretary of Defense shall issue such regulations as may be necessary to insure that the provision of any assistance (including the provision of any equipment or facility or the assignment of any personnel) to any civilian law enforcement official under this chapter does not include or permit direct participation by a member of the Army, Navy, Air Force, or Marine Corps in an interdiction of a vessel or aircraft, a search and seizure, arrest, or other similar activity unless participation in such activity by such member is otherwise authorized by law.”

10 USC § 376. Support not to affect adversely military preparedness

Support (including the provision of any equipment or facility or the assignment or detail of any personnel) may not be provided to any civilian law enforcement official under this chapter if the provision of such support will adversely affect the military preparedness of the United States. The Secretary of Defense shall prescribe such regulations as may be necessary to ensure that the provision of any such support does not adversely affect the military preparedness of the United States.
(Added Pub. L. 97–86, title, IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1116; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2045.)
Amendments
1988—Pub. L. 100–456 substituted “Support” for “Assistance” in section catchline and amended text generally. Prior to amendment, text read as follows: “Assistance (including the provision of any equipment or facility or the assignment of any personnel) may not be provided to any civilian law enforcement official under this chapter if the provision of such assistance will adversely affect the military preparedness of the United States. The Secretary of Defense shall issue such regulations as may be necessary to insure that the provision of any such assistance does not adversely affect the military preparedness of the United States.”

10 USC § 377. Reimbursement

(a) Subject to subsection (c), to the extent otherwise required by section 1535 of title 31 (popularly known as the “Economy Act”) or other applicable law, the Secretary of Defense shall require a civilian law enforcement agency to which support is provided under this chapter to reimburse the Department of Defense for that support.
(b)(1) Subject to subsection (c), the Secretary of Defense shall require a Federal agency to which law enforcement support or support to a national special security event is provided by National Guard personnel performing duty under section 502(f) of title 32 to reimburse the Department of Defense for the costs of that support, notwithstanding any other provision of law. No other provision of this chapter shall apply to such support.
(2) Any funds received by the Department of Defense under this subsection as reimbursement for support provided by personnel of the National Guard shall be credited, at the election of the Secretary of Defense, to the following:
(A) The appropriation, fund, or account used to fund the support.
(B) The appropriation, fund, or account currently available for reimbursement purposes.

(c) An agency to which support is provided under this chapter or section 502(f) of title 32 is not required to reimburse the Department of Defense for such support if the Secretary of Defense waives reimbursement. The Secretary may waive the reimbursement requirement under this subsection if such support—
(1) is provided in the normal course of military training or operations; or
(2) results in a benefit to the element of the Department of Defense or personnel of the National Guard providing the support that is substantially equivalent to that which would otherwise be obtained from military operations or training.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1116; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2045; Pub. L. 110–181, div. A, title X, §1061, Jan. 28, 2008, 122 Stat. 319.)

10 USC § 378. Nonpreemption of other law

Nothing in this chapter shall be construed to limit the authority of the executive branch in the use of military personnel or equipment for civilian law enforcement purposes beyond that provided by law before December 1, 1981.
(Added Pub. L. 97–86, title IX, §905(a)(1), Dec. 1, 1981, 95 Stat. 1116; amended Pub. L. 98–525, title XIV, §1405(10), Oct. 19, 1984, 98 Stat. 2622; Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2045.)

10 USC § 379. Assignment of Coast Guard personnel to naval vessels for law enforcement purposes

(a) The Secretary of Defense and the Secretary of Homeland Security shall provide that there be assigned on board every appropriate surface naval vessel at sea in a drug-interdiction area members of the Coast Guard who are trained in law enforcement and have powers of the Coast Guard under title 14, including the power to make arrests and to carry out searches and seizures.
(b) Members of the Coast Guard assigned to duty on board naval vessels under this section shall perform such law enforcement functions (including drug-interdiction functions)—
(1) as may be agreed upon by the Secretary of Defense and the Secretary of Homeland Security; and
(2) as are otherwise within the jurisdiction of the Coast Guard.

(c) No fewer than 500 active duty personnel of the Coast Guard shall be assigned each fiscal year to duty under this section. However, if at any time the Secretary of Homeland Security, after consultation with the Secretary of Defense, determines that there are insufficient naval vessels available for purposes of this section, such personnel may be assigned other duty involving enforcement of laws listed in section 374(b)(4)(A) of this title.
(d) In this section, the term “drug-interdiction area” means an area outside the land area of the United States (as defined in section 374(b)(4)(B) of this title) in which the Secretary of Defense (in consultation with the Attorney General) determines that activities involving smuggling of drugs into the United States are ongoing.
(Added Pub. L. 99–570, title III, §3053(b)(1), Oct. 27, 1986, 100 Stat. 3207–75; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2045; Pub. L. 107–296, title XVII, §1704(b)(1), Nov. 25, 2002, 116 Stat. 2314.)

10 USC § 380. Enhancement of cooperation with civilian law enforcement officials

(a) The Secretary of Defense, in cooperation with the Attorney General, shall conduct an annual briefing of law enforcement personnel of each State (including law enforcement personnel of the political subdivisions of each State) regarding information, training, technical support, and equipment and facilities available to civilian law enforcement personnel from the Department of Defense.
(b) Each briefing conducted under subsection (a) shall include the following:
(1) An explanation of the procedures for civilian law enforcement officials—
(A) to obtain information, equipment, training, expert advice, and other personnel support under this chapter; and
(B) to obtain surplus military equipment.

(2) A description of the types of information, equipment and facilities, and training and advice available to civilian law enforcement officials from the Department of Defense.
(3) A current, comprehensive list of military equipment which is suitable for law enforcement officials from the Department of Defense or available as surplus property from the Administrator of General Services.

(c) The Attorney General and the Administrator of General Services shall—
(1) establish or designate an appropriate office or offices to maintain the list described in subsection (b)(3) and to furnish information to civilian law enforcement officials on the availability of surplus military equipment; and
(2) make available to civilian law enforcement personnel nationwide, tollfree telephone communication with such office or offices.
(Added Pub. L. 100–180, div. A, title XII, §1243(a), Dec. 4, 1987, 101 Stat. 1163; amended Pub. L. 100–456, div. A, title XI, §1104(a), Sept. 29, 1988, 102 Stat. 2046.)

10 USC § 381. Procurement of equipment by State and local governments through the Department of Defense: equipment for counter-drug, homeland security, and emergency response activities

(a) Procedures.—(1) The Secretary of Defense shall establish procedures in accordance with this subsection under which States and units of local government may purchase equipment suitable for counter-drug, homeland security, and emergency response activities through the Department of Defense. The procedures shall require the following:
(A) Each State desiring to participate in a procurement of equipment suitable for counter-drug, homeland security, or emergency response activities through the Department of Defense shall submit to the Department, in such form and manner and at such times as the Secretary prescribes, the following:
(i) A request for equipment.
(ii) Advance payment for such equipment, in an amount determined by the Secretary based on estimated or actual costs of the equipment and administrative costs incurred by the Department.

(B) A State may include in a request submitted under subparagraph (A) only the type of equipment listed in the catalog produced under subsection (c).
(C) A request for equipment shall consist of an enumeration of the equipment that is desired by the State and units of local government within the State. The Governor of a State may establish such procedures as the Governor considers appropriate for administering and coordinating requests for equipment from units of local government within the State.
(D) A State requesting equipment shall be responsible for arranging and paying for shipment of the equipment to the State and localities within the State.

(2) In establishing the procedures, the Secretary of Defense shall coordinate with the General Services Administration and other Federal agencies for purposes of avoiding duplication of effort.
(b) Reimbursement of Administrative Costs.—In the case of any purchase made by a State or unit of local government under the procedures established under subsection (a), the Secretary of Defense shall require the State or unit of local government to reimburse the Department of Defense for the administrative costs to the Department of such purchase.
(c) GSA Catalog.—The Administrator of General Services, in coordination with the Secretary of Defense, shall produce and maintain a catalog of equipment suitable for counter-drug, homeland security, and emergency response activities for purchase by States and units of local government under the procedures established by the Secretary under this section.
(d) Definitions.—In this section:
(1) The term “State” includes the District of Columbia, the Commonwealth of Puerto Rico, the Commonwealth of the Northern Mariana Islands, and any territory or possession of the United States.
(2) The term “unit of local government” means any city, county, township, town, borough, parish, village, or other general purpose political subdivision of a State; an Indian tribe which performs law enforcement or emergency response functions as determined by the Secretary of the Interior; or any agency of the District of Columbia government or the United States Government performing law enforcement or emergency response functions in and for the District of Columbia or the Trust Territory of the Pacific Islands.
(3) The term “equipment suitable for counter-drug, homeland security, and emergency response activities” has the meaning given such term in regulations prescribed by the Secretary of Defense. In prescribing the meaning of the term, the Secretary may not include any equipment that the Department of Defense does not procure for its own purposes and, in the case of equipment for homeland security activities, may not include any equipment that is not found on the Authorized Equipment List published by the Department of Homeland Security.
(Added Pub. L. 103–160, div. A, title XI, §1122(a)(1), Nov. 30, 1993, 107 Stat. 1754; amended Pub. L. 110–417, [div. A], title VIII, §885(a), (b)(1), Oct. 14, 2008, 122 Stat. 4560, 4561.)

10 USC § 382. Emergency situations involving weapons of mass destruction

(a) In General.—The Secretary of Defense, upon the request of the Attorney General, may provide assistance in support of Department of Justice activities relating to the enforcement of section 175, 229, or 2332a of title 18 during an emergency situation involving a weapon of mass destruction. Department of Defense resources, including personnel of the Department of Defense, may be used to provide such assistance if—
(1) the Secretary of Defense and the Attorney General jointly determine that an emergency situation exists; and
(2) the Secretary of Defense determines that the provision of such assistance will not adversely affect the military preparedness of the United States.

(b) Emergency Situations Covered.—In this section, the term “emergency situation involving a weapon of mass destruction” means a circumstance involving a weapon of mass destruction—
(1) that poses a serious threat to the interests of the United States; and
(2) in which—
(A) civilian expertise and capabilities are not readily available to provide the required assistance to counter the threat immediately posed by the weapon involved;
(B) special capabilities and expertise of the Department of Defense are necessary and critical to counter the threat posed by the weapon involved; and
(C) enforcement of section 175, 229, or 2332a of title 18 would be seriously impaired if the Department of Defense assistance were not provided.

(c) Forms of Assistance.—The assistance referred to in subsection (a) includes the operation of equipment (including equipment made available under section 372 of this title) to monitor, contain, disable, or dispose of the weapon involved or elements of the weapon.
(d) Regulations.—(1) The Secretary of Defense and the Attorney General shall jointly prescribe regulations concerning the types of assistance that may be provided under this section. Such regulations shall also describe the actions that Department of Defense personnel may take in circumstances incident to the provision of assistance under this section.
(2)(A) Except as provided in subparagraph (B), the regulations may not authorize the following actions:
(i) Arrest.
(ii) Any direct participation in conducting a search for or seizure of evidence related to a violation of section 175, 229, or 2332a of title 18.
(iii) Any direct participation in the collection of intelligence for law enforcement purposes.

(B) The regulations may authorize an action described in subparagraph (A) to be taken under the following conditions:
(i) The action is considered necessary for the immediate protection of human life, and civilian law enforcement officials are not capable of taking the action.
(ii) The action is otherwise authorized under subsection (c) or under otherwise applicable law.

(e) Reimbursements.—The Secretary of Defense shall require reimbursement as a condition for providing assistance under this section to the extent required under section 377 of this title.
(f) Delegations of Authority.—(1) Except to the extent otherwise provided by the Secretary of Defense, the Deputy Secretary of Defense may exercise the authority of the Secretary of Defense under this section. The Secretary of Defense may delegate the Secretary's authority under this section only to an Under Secretary of Defense or an Assistant Secretary of Defense and only if the Under Secretary or Assistant Secretary to whom delegated has been designated by the Secretary to act for, and to exercise the general powers of, the Secretary.
(2) Except to the extent otherwise provided by the Attorney General, the Deputy Attorney General may exercise the authority of the Attorney General under this section. The Attorney General may delegate that authority only to the Associate Attorney General or an Assistant Attorney General and only if the Associate Attorney General or Assistant Attorney General to whom delegated has been designated by the Attorney General to act for, and to exercise the general powers of, the Attorney General.
(g) Relationship to Other Authority.—Nothing in this section shall be construed to restrict any executive branch authority regarding use of members of the armed forces or equipment of the Department of Defense that was in effect before September 23, 1996.
(Added Pub. L. 104–201, div. A, title XIV, §1416(a)(1), Sept. 23, 1996, 110 Stat. 2721; amended Pub. L. 105–85, div. A, title X, §1073(a)(6), Nov. 18, 1997, 111 Stat. 1900; Pub. L. 111–383, div. A, title X, §1075(b)(10)(A), (B), Jan. 7, 2011, 124 Stat. 4369; Pub. L. 112–81, div. A, title X, §1089, Dec. 31, 2011, 125 Stat. 1603.)
Military Assistance to Civil Authorities To Respond to Act or Threat of Terrorism
Pub. L. 106–65, div. A, title X, §1023, Oct. 5, 1999, 113 Stat. 747, authorized the Secretary of Defense, upon the request of the Attorney General, to provide assistance to civil authorities in responding to an act of terrorism or threat of an act of terrorism within the United States, if the Secretary determined that certain conditions were met, subject to reimbursement and limitations on funding and personnel, and provided that this authority applied between Oct. 1, 1999, and Sept. 30, 2004.