What is the purpose of the Posse Comitatus Act?

The Posse Comitatus Act serves the purpose of limiting federal military involvement in domestic policies. Enacted in 1878, this law restricts the U.S. Army and Air Force from acting as a domestic police force. Its primary intent is to preserve the distinction between military and civilian roles in the context of law enforcement, thereby ensuring that the military does not interfere in or take over domestic law enforcement functions that are traditionally managed by local or state authorities.

For instance, while the military may provide support during national emergencies or natural disasters, that support does not extend to performing law enforcement duties, as outlined by the Act. This legal boundary helps maintain civilian control over the military and protects individual rights against potential overreach by military forces in the everyday lives of citizens.