Posse Comitatus

Cohen Predicts Army Will Patrol Streets
Sightings Political Articles

But using the U.S. military in a domestic law enforcement role would require revisions to laws in force for more than a century, cautions Shreveport attorney John Odom, Jr. “You can't do it from the Defense Department side unless Congress dramatically revises the Posse Comitatus laws.” said Odom, a colonel in the U.S. Air Force Reserve and a reserve Judge Advocate. “The 1878 law specifically prohibits the use of the military in domestic law enforcement unless authorized by Congress or the Constitution and does not allow for military intervention through action by the Secretary of Defense of even an Executive Order from the President” Odom said.