I'm a AHA CPR instructor and I make it pretty clear to my students when you can stop CPR when:

a)you are to tired to go on
b)higher medical authority tells you to stop
c)higher medical authority takes over

Now if you guys want to talk about stolen stuff... I was on a call one time where food delivery guy got hit by the car. We were working him up and his take out delivery food (chinese) was next to him in the paper bag. There was wall of people around us and out of the sudden I see this hand appear and steal the food. Wicked.

Our ambulances sometimes are called to the projects (low income housing) where somebody is stalling us in the apt and after long physical exam and interview they refuse to go and meantime ambulance gets robbed downstairs.