[meowface]

I can see how this could be a risk if it were an assumption they make, but my guess is all PDs would consider human reports far more reliable than ShotSpotter alerts. I'm sure in all or almost all areas, a 911 report of a gunshot is much more likely to be a true positive compared to any automated alert. A lack of a report doesn't imply a lack of an incident, but the presence of a report implies a high likelihood that there is an incident.

A system could be considered generally "sensitive" in some way (e.g. seemingly firing in response to any loud noise) while actually performing poorly in terms of statistical sensitivity (the percentage of actual gunshots that the system detects and alerts on with high confidence).