Good thought, but I doubt that comms are recorded at remote temporary locations such as the Butler, PA rally.
Police departments have a central dispatch system and are working from a fixed location and in one area, so it is easy to have recording equipment for the radio traffic.
Secret Service move from location to location, and wouldn’t set up a temporary recording system just for radio traffic. They might (and probably do) have such a system for permanent fixed locations such as the White House.
Additional thought: They might have a mobile command post vehicle with recording equipment on site, so maybe there would be recordings.
Why not? All it would take is a laptop or smart phone on a USB output to the command center radio. Given the importance of radio communications in police actions, I cannot believe that the evidentiary demands in court cases subsequent to the use of deadly force haven't long ago made such a feature a factory standard in police radio systems.
Everything over radio frees or mobile phones are recorded by the CIA. It may take 50 years for the recordings to be released but they are there.
“Good thought, but I doubt that comms are recorded at remote temporary locations such as the Butler, PA rally.
“Huh? Everything is recorded, across all agencies. A lot of that stuff is retained for 1 year, unless there is a notable event, then it’s saved for a specified time as determined by the agency or higher authority.