Sam Law, a graduate student at the University of Texas at Austin, was one of roughly 80 people arrested and charged with criminal trespassing for protesting the war in Gaza on his campus at the end of April.

Someone had apparently read a dispersal order over a loudspeaker at that April 29 protest, Law said, citing his arrest affidavit, but he doesn't remember hearing one.

"I was on my own campus exercising my right to speak," he said.