Well, from an ambulance point of view, we don't carry anything to break into a car......other than kicking the window in, and even then, will the door open if it is deadlocked?
I've got a lifehammer as part of the responder kit I was issued with... but never had reason to use it as the Fire Station is only 2 mins from where I live and I've not been to an RTC where they were not called out as well.
WRT deadlocks - my experience with these is that they are operated from outside the vehicle (e.g. a second press of the "lock" button on the remote, or only by the key/remote) and not by the internal (manual or auto) lock.