One of these six cops found Roberts identification card that showed he was a supervisor at the IPRA. Once they discovered that Roberts was a man who is tasked with holding police accountable for a living, the dashcam recording of the incident goes black.
The irony, in this case, is that the IPRA rarely finds cops at fault for anything, even when they shoot and kill innocent women.
Perhaps the reason for the failure of the IPRA to hold cops accountable is that they are all afraid they may end up like Davis or Roberts.