Most departments have guidelines as to what you can and cannot use. Alot that i know of don't allow the use of lasers and some even flashlights on duty weapons with the exception of ar's or if your on a swat or special response team. Bigger dept's have to go through their armory and in a situation that you have to use the weapon it becomes a liability issue seeing as the shark attorney will probably give some insight as to you adding all these cool gadgets because you are looking for a fight or want to kill someone. Personally just some good ole night sights and a handy led flashlight on your belt are all you need.