Most large cities have had this kind of system for some time, the perfect test environment...not sure about Chitcago, either never installed or the constant ring of gunfire has the thing so screwed up it can't tell one source from another.
But whatever, I'm with 'Soup...this is just one of many weights tilting things the wrong direction...corrective action will come, it's matter of when not if.
But yeah, looks like a vulnerable system on more than one front.