In Chicago those sensors wouldn't last 24hrs !!
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That's the thing. When they get sick of responding to every door slamming on the west side of Chicago they will shut them off just like they do with open door sensors in jails.This might not cancel the HPA because suppressors are not currently used by gang bangers (or at least not reported). Also, remember that suppressors don't muffle the supersonic crack of a bullet and are not movie quiet. There still is a sonic signature that the system could capture and report on. That being said; how would like to monitor that system New Year's Eve from dark to dawn.
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If the HPA can't be passed because we don't have a rebuttal to a lame argument like this, the wrong people are supporting it.