He already stood trial. Most of the arrests are being done out of the public eye, since the average person is still so deeply brainwashed that they'd freak out if they saw people they love, such as Hollywood stars, being publicly arrested, and the trials are being conducted via military tribunal at U.S. military bases, Iceworm base in Greenland being one. Too many normal courts are still stacked with dark agents, so military tribunal is the only way.