They may get a request to respond to an emergency at any moment.
Yes, in many places it is illegal to leave a car running unattended due to the risk of theft or accidents.
Yes, in many places it is illegal to leave your car running unattended due to the risk of theft or accidents.
Usually when parked at a speed trap or when stationary.
yes
a four leave clover ;) JK
because they don't know who or what is in the car running from them.
No.
yes it is
leave a note with your info or call the police
you can not leave the scene of a accident
keep it running for short times
He is checking to see if the trunk is unlocked, and whether or not the car is running. It also allows him to feel movement in the car that he may not see. Actually it is to leave fingerprints on the vehicle in case the traffic stop goes badly. This helps the prosecution establish proof that the police office was in "contact" with the vehicle.