Does anyone know more about the current common retention rules? Seems to me an easy way to cut down on the amount stored is to detect for interactions (say, ot

Does anyone know more about the current common retention rules? Seems to me an easy way to cut down on the amount stored is to detect for interactions (say, other voices in the recording, definitely gun shots, etc), and then save an amount before, after and during. Maybe twice the response time for a call, for the before? The after may be harder. You can then pair it down from there. Or, could dispatch control it? Start recording when dispatched / called, stop recording when the situation is resolved, according to dispatch.