But as the article says, they need the original audio in order to improve the gunshot detection - for example, if a gunshot is reported elsewhere but the detect

But as the article says, they need the original audio in order to improve the gunshot detection - for example, if a gunshot is reported elsewhere but the detector doesn't classify it, they can grab the audio from the record to train the detector and hopefully improve it. If you never capture the raw audio, you won't be able to train the system to better detect the gunshots and to reduce false positives.