Yeah, but the only reason anyone listened to those sections (or was even able to listen to these sections) of tape was because they contained shootings. These s

Yeah, but the only reason anyone listened to those sections (or was even able to listen to these sections) of tape was because they contained shootings. These systems work on a rolling buffer storage system; they're constantly recording to a buffer that contains the last N minutes of audio and if a triggering event occurs, it gets written out to a file that is reviewed by a person and if it contains a gunshot, that person confirms there was a gunshot (ie that it wasn't a firework or something) and a notification goes out to the relevant police district/precinct/whatever for that area. If there's just people talking but no gunshots, the buffer never writes out and it's overwritten before too long.