The American Civil Liberties Union says The Force, errr, First Amendment is with Sam O'Hara, filing a lawsuit on his behalf after he was handcuffed and detained after following National Guard troops in Washington, D.C. playing the Darth Vader theme from the Star Wars film franchise.
Although I agree they have no business being deployed as police, if they are deployed as police, they need to get some training, and this is completely foreseeable.