Federal ICE and Border Patrol agents used tear gas and pepper balls to disperse protesters outside a Chicago-area ICE detention facility during demonstrations against immigration enforcement operations. Protesters have included a pastor and two Democratic congressional candidates, with at least three arrests and clashes between agents and demonstrators. Video reviewed by NBC 5 Investigates shows a protester struck in the back of the head and face by a pepper ball during a September 26 demonstration, and another protester's back was covered in bruises from apparent pepper ball strikes. The incidents have raised questions about whether agents violated Border Patrol's own use-of-force policy, which restricts targeting the head, neck, spine or groin with compressed air launchers, as well as a judge's standing order limiting use of chemical agents.