It could come at the behest of police as in "it would be really helpful to our case if there was ShotSpotter evidence to support our cased". It could come from the fact that ShotSpotter is losing customers, and willing to do anything to make the product "feel" more valuable to the police to ensure cash cows keep producing.

The modern criminal investigation has so much negative baggage attached, from historical shenianigans, that it's easy to find ways to question the prosecution's case.