20 Stat. L., 145 June 18, 1878
SEC. 15. From and after the passage of this act it shall not be
lawful to employ any part of the Army of the United States, as a posse
comitatus, or otherwise, for the purpose of executing the laws, except
in such cases and under such circumstances as such employment of said
force may be expressly authorized by the Constitution or by act of
Congress; and no money appropriated by this act shall be used to pay
any of the expenses incurred in the employment of any troops in
violation of this section And any person willfully violating the
provisions of this section shall be deemed guilty of a misdemeanor and
on conviction thereof shall be punished by fine not exceeding ten
thousand dollars or imprisonment not exceeding two years or by both
such fine and imprisonment.
10 U.S.C. (United States Code) 375
Sec. 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.