The Posse Comitatus Act Explained

Summary

The Posse Comitatus Act bars federal troops from participating in civilian law enforcement except when expressly authorized by law. This 143-year-old law embodies an American tradition that sees military interference in civilian affairs as a threat to both democracy and personal liberty. However, recent events have revealed dangerous gaps in the law’s coverage that Congress must address. What does the term “posse comitatus” mean? In British and American law, a posse comitatus is a group of people who are mobilized by the sheriff to suppress lawlessness in the county. In any classic Western film, when a lawman gathers a “posse” to pursue the outlaws, they are forming a posse comitatus. The Posse Comitatus Act is so named because one of the things it prohibits is using soldiers rather than civilians as a posse comitatus. What are the origins of the Posse Comitatus Act? The Posse Comitatus Act was passed in 1878, after the end of Reconstruction and the return of white supremacists to political power in both southern states and Congress. Through the law, Congress sought to ensure that the federal military would not be used to intervene in the establishment of Jim Crow in the former Confederacy. Despite the ignominious origins of the law itself, the broader principle that the military should not be allowed to interfere in the affairs of civilian government is a core American value. It finds expression in the Constitution’s division of power over the military between Congress and the president, and in the guarantees of the Third, Fourth, Fifth, and Sixth Amendments, which were in part reactions to abuses committed by the British army against American colonists. Today, the Posse Comitatus Act operates as an extension of these constitutional safeguards. Moreover, there are statutory exceptions to the law that allow the president to use the military to suppress genuine rebellions and to enforce federal civil rights laws. What does the Posse Comitatus Act say? The Posse Comit...