The major problem, as I've mentioned here in other threads, is that most officers now are not "shooters" so they only fire enough rounds to qualify every six months to a year. There is no iincentive for them to shoot on thier off time. Additionally, law enforcement training takes time (money) to change. If a forward thinking instructor wants to add a new course of fire, say night "practical" shooting (movement, reactive targets ect) he has to get approval from the department, which usually has to ask the state if it's required. If the department is in an anti-gun state it's a prettty good bet that the state level administrators are going to freak about anything "tactical" that requires more shooting so the answer is NO. Even is they say they can fire it, they have to get the money for extra ammo and the targets. Then the department gets blamed for stockpiling for war. Most larger departments have better ranges, but they are also predominately "square range" with very limited ractive targets or anything steel.
There are departments that have 'Got it" and started taking courses of fire from IDPA and USPSA so officers have "seen" a multi-dimensional shooting problem before they hit the street. Similar to Top Gun and Red Flag were pilots "fight" a war so when they're in the real thing they can react to it. Shooting sports may not be 100% accurate training, but it along with SImunitions can greatly affect the outcome in a real world shoot out.
So an officer (or soldier for that matter) , under pressure, at night, with returning fire, with MINIMAL training is probably not going going to hit CRAP. An officer that has a little more training, better mental preperation is going to have better shots. He'll still miss, but he'll miss smaller less.
The first goal is for everybody to go home at the end of the day. Try and avoid ANY casualties. All well and good until the shots are coming at you; then it's get your head down, try and get HIS head down, don't hit anything you don't want if you can.