OK - I've mentioned on here before that I listen to the Chicago PD radio feed a lot
After the initial realization that 'shots fired' was something that happened 2 or 3 times an hour, and that the most frequent call is 'I'm at home and someone is trying to force the door open!!!' the other thing I noticed was that when some form of emergency call is made they also say things like 'Fire's rolling' - presumably meaning the Fire Service.
Now I understand why they might be called to RTA's, but what I don't get is why the Fire Service are called to things like (possible) overdoses, shootings, domestic violence calls, etc. rather than Ambulances - anyone shed some light please?