Waller complained of chipped teeth, a bloodied lip, badly bruised ribs and possibly a concussion in the beating July 22, 2014, in an interview room at the Central Patrol station.

He said that when he complained after Carroll left, a police lieutenant gave him a black eye. The accused supervisor has not been charged or disciplined because Waller could not pick his picture from a lineup.

Officers refused to allow Waller to go to the hospital or get a lawyer, he said, and threatened to plant a gun and drugs on him, or kill him, if he told anyone what happened.

No police employee has admitted seeing or hearing the attack, including two who demanded and were granted immunity from prosecution.

Carroll and at least one other officer had given some assistant circuit attorneys unauthorized ride-alongs, according to court documents and testimony.

During one, Carroll allowed a close friend, Bliss Barber Worrell, to use his Taser to chase a suspect. Worrell seized drugs from another suspect, yet her involvement was not documented in police reports, Assistant U.S. Attorney Fara Gold said Wednesday.

Ambry Schuessler testified under immunity Wednesday about misconduct by a “clique” of young prosecutors. She and Worrell have resigned.