I do not think PD should be able to throw up a random check point at any given time in between cities. I agree with @Herzog If the current Govenor/President feels the need to set up a "sting" in a certain area that might be ok. But I do feel that DUI checkpoints maybe once a week in random places chosen by the police chief would be good RP for both PD and Citizen and who knows it could lead to some exciting moments!