LE is too busy raising revenue to bother with unprofitable activities like this. Yesterday my wife and I were stuck in slowly moving traffic and I was able to clearly see the setup on the trunk lid of a Bufford po-lice car. There were three permanently mounted laser speed guns one at 45 deg to the right, one at 45 deg to the left and one about 80 degrees to the left.
12 years ago, I went to Disney World and was shocked to see Jacksonville or Florida deputies or state police on the overpass of 95 with radar guns and about 10 cops on motorcycles pulling dozens and dozens of people over.