The Posse Comitatus Act was passed in 1878 as the Reconstruction drew to a close and troops were pulled out of the southeastern United States. The idea was to prevent the military from enforcing laws. After all, that’s what law enforcement is for — state and local police forces are the ones deputized to do that work. But what does it mean when the police use military gear and tactics to enforce that law? Ashley Farmer, Assistant Professor of Criminal Justice Sciences at Illinois State University breaks it down.

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