Radley Balko’s book, which is cited in the article, "Rise of the Warrior Cop"[0] actually makes a very good argument that the 3rd Amendment which prohibits the quartering of soldiers during peacetime was referencing this exact situation, wherein a group of government controlled "peace officers", which are essentially military personnel, are in constant deployment inside the United States of America keeping tabs on it's citizens. He argues that it has nothing to do with literally being forced to give up your bed to a soldier, but entirely with the state housing soldiers within it's walls. With the gifting of Tanks, M16s and other paramilitary gear to ordinary police officers, we're essentially creating another branch of the armed forces.

[0] http://www.amazon.com/dp/1610392116/