Per the Posse Comitatus Act, military forces can provide civil support in order to save lives, prevent injuries and provide temporary critical life support, but cannot become directly involved in law enforcement.
Posse Comitatus Act, a United States federal law prohibiting members of the military from exercising powers that maintain "law and order" on non-federal property
The original provision was enacted as Section 15 of chapter 263, of the Acts of the 2nd session of the 45th Congress.
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On March 10, 2009, active duty U.S. Army Military Police troops from Fort Rucker were deployed to Samson, Alabama, in response to a murder spree.
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