Posse Comitatus: How a 19th century law limits how the U.S. military can be used within the country’s borders https://www.tucsonsentinel.com/nationworld/report/012825_posse_comitatus/posse-comitatus-how-19th-century-law-limits-how-us-military-can-used-within-countrys-borders/
Much of what military troops at the border will be allowed to do — and what they aren’t — is proscribed in federal regulations relating to a law passed at the end of Reconstruction: The Posse Comitatus Act.
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