Among other things, the U.S. Supreme Court. The court has ruled on a number of occasions, most recently in a 1989 case Blanton v. City of North Las Vegas, that any criminal offense for which the maximum penalty is less than six months in prison is presumed to be a petty offense and the right of trial by jury guaranteed by the Sixth Amendment does not apply. Arizona has modified that slightly, in Derendal v. Phoenix City Prosecutors Office for example, so that misdemeanor charges that would have warranted a jury trial before Arizona became a state would still require a jury. All other misdemeanor cases would be handled as bench trials. Arpiao's charges were misdemeanors with a maximum penalty of less than six months. Under those circumstances he was not entitled to a jury trial.
The real reason Joe got railroaded was because Joe went after Obama’s fake birth certificate- I don’t care what anyone says, if you research it, Obama is not a natural born citizen. Social Security card was a fake proven by e-verify, his draft card application was a proven fake. Obama is a phony and should never have been President. He should be in prison for all the shit he pulled on the American people. The media succeeded in covering for this criminal for these things and a boat-load more. That lying asshole is the most treasonous bastard to ever occupy the White House.