The Posse Comitatus Act states that: Whoever, except in cases and under circumstances expressly authorised by the Constitution or Act of Congress, wilfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both. This Act reflects an American tradition that bridles at military involvement in civilian affairs. Congress, however has approved a number of instances where extraordinary circumstances warrant a departure from the general rule, particularly in cases where the armed forces provide civilian assistance without becoming directly involved in civilian law enforcement. This compelling book provides a brief background along with current issues that highlight the Act by drawing attention to its existence and importance. CONTENTS: Preface; The Origins of the Posse Comitatus; The Posse Comitatus Act and Related Matters: A Sketch; The Posse Comitatus Act and Related Matters: The Use of the Military to Execute Civilian Law; Index.

The Posse Comitatus Act states that: Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both. 18 U.S.C. § 1385. It reflects an American tradition that bridles at military involvement in civilian affairs. Congress, however, has approved a number of instances where extraordinary circumstances warrant a departure from the general rule, particularly in cases where the armed forces provide civilian assistance without becoming directly involved in civilian law enforcement. This is an abridged version of CRS Report R42659, The Posse Comitatus Act and related matters : the use of the military to execute civilian law, in which the authorities for the statements made here may be found.

The Constitution permits Congress to authorize the use of the militia "to execute the Laws of the Union, suppress Insurrections and repel Invasions." And it guarantees the states protection against invasion or usurpation of their "republican form of government," and, upon the request of the state legislature, against "domestic violence." These constitutional provisions are reflected in the Insurrection Acts, which have been invoked numerous times both before and after passage of the Posse Comitatus Act, 18 U.S.C. Section 1385, in 1878. Congress has also enacted a number of statutes that authorize the use of land and naval forces to execute their objective. The Posse Comitatus Act outlaws the willful use of any part of the Army or Air Force to execute the law unless expressly authorized by the Constitution or an act of Congress. History supplies the grist for an argument that the Constitution prohibits military involvement in civilian affairs subject to only limited alterations by Congress or the President, but the courts do not appear to have ever accepted the argument unless violation of more explicit constitutional command could also be shown. The express statutory exceptions include the legislation that allows the President to use military force to suppress insurrection or to enforce federal authority, 10 U.S.C. Sections 251-255, and laws that permit the Department of Defense to provide federal, state and local police with information, equipment, and personnel, 10 U.S.C. §§ 271-284. Case law indicates that "execution of the law" in violation of the Posse Comitatus Act occurs (a) when the Armed Forces perform tasks assigned to an organ of civil government, or (b) when the Armed Forces perform tasks assigned to them solely for purposes of civilian government. Questions concerning the act's application arise most often in the context of assistance to civilian police. At least in this context, the courts have held that, absent a recognized exception, the Posse Comitatus Act is violated when (1) civilian law enforcement officials make "direct active use" of military investigators; or (2) the use of the military "pervades the activities" of the civilian officials; or (3) the military is used so as to subject "citizens to the exercise of military power which was regulatory, prescriptive, or compulsory in nature." The act is not violated when the Armed Forces conduct activities for a military purpose. The language of the act mentions only the Army and the Air Force, but it is applicable to the Navy and Marines by virtue of administrative action and commands of other laws. The law enforcement functions of the Coast Guard have been expressly authorized by act of Congress and consequently cannot be said to be contrary to the act. The act has been applied to the National Guard when it is in federal service, to civilian employees of the Armed Forces, and to off-duty military personnel. The act probably only applies within the geographical confines of the United States, but supplemental provisions of 10 U.S.C. §§ 271-284 appear to apply worldwide. Finally, the act is a criminal statute under which there has been but a handful of known prosecutions. Although violations will on rare occasions result in the exclusion of evidence, the dismissal of criminal charges, or a civil cause of action, as a practical matter compliance is ordinarily the result of military self-restraint. This report provides an historical analysis of the use of the Armed Forces to execute domestic law and of the Posse Comitatus Act, including their apparent theoretical and constitutional underpinnings. The report then outlines the current application of the act as well as its statutory exceptions, and reviews the consequences of its violation.

The Posse Comitatus Act states that: Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both. 18 U.S.C. 1385. It reflects an American tradition that bridles at military involvement in civilian affairs. Congress, however, has approved a number of instances where extraordinary circumstances warrant a departure from the general rule, particularly in cases where the armed forces provide civilian assistance without becoming directly involved in civilian law enforcement. This is an abridged version of The Posse Comitatus Act and Related Matters: The Use of the Military to Execute Civilian Law, CRS Report 95-964 in which the authorities for the statements made here may be found. This report summarizes proposed bills that could result in increased interaction between military and civil authorities. (H.R. 1986, H.R. 1815, S. 1042, S. 1043).