According to our laws, I'd imagine the Posse Comitatus Act would come into play.
Quote:
The Posse Comitatus Act is an often misunderstood and misquoted United States federal law (18 U.S.C. § 1385) passed on June 18, 1878, after the end of Reconstruction. Its intent (in concert with the Insurrection Act of 1807) was to limit the powers of local governments and law enforcement agencies from using federal military personnel to enforce the laws of the land. Contrary to popular belief, the Act does not prohibit members of the Army from exercising nominally state law enforcement, police, or peace officer powers that maintain "law and order"; it simply requires that any orders to do so must originate with the United States Constitution or Act of Congress.
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Here is a link to its Wikipedia page:
http://en.wikipedia.org/wiki/Posse_Comitatus_Act