Please don't give LEO's carte blanche on the intelligence scale. There are tons of vague, and relatively unknown rules and regulations. A regular LEO is simply not going to have the ability to remember all those obscure regulations that rarely come up.
Been there and seen that the LEO's make simple mistakes and don't know everything. Just the name of the game, they are not super heroes. When you can get varying answers from the DMV and they have the rule books right there in front of them, there's no reason to believe that a LEO will be any better.