Originally Posted by azn2nr
what im looking for is where, if avaiable, it says that the law must be enforced. the above indicates the extent to which the law can be enforced but not that it is to be enforced in the first place.
I don't think what you're looking for would be part of the law as it's contained in the state code. It's going to be departmental policy and that will differ from agency to agency.
For example... this is what the Utah Highway Patrol has to say about it
"Each law enforcement officer is given discretion in their enforcement of the law. Therefore, the speed limit enforcement tolerance varies between troopers and circumstances."