Precisely the reason I always carried a key to the door of the squad car with me. Leave it running, but lock it. And anytime the car was outside my physical control it was locked. I had this paranoia about getting killed with my own shotgun or carbine,.
I'd rather be killed with my own shotgun.
It would save me from having to explain why I had to finish my shift in a Taxi

And they drove an ARMORED van why? 
FQ13
At $4.75/hour I don't think that crossed their minds.