When I assess an article or book or person claiming to teach police or law enforcement defensive tactics... the very first thing I look for is simply whether they actually show anyone wearing a gun belt (or address the issues). If they don't -- I pretty much dismiss the material. It doesn't address the realities of modern, US law enforcement. We wear gun belts; we carry guns and OC and batons and other stuff. Now, I'm not saying that every technique has to be demonstrated with a gun belt on -- but somewhere in the material, it has to be clear that the various issues of carrying a gun, wearing a gun belt, and body armor have been addressed. They do change how you move; they do restrict your options and flexibility some.
That is very, very important in your line of work. Gun Belts with baton, OC, hand cuffs, radio, etc. how it is laid out and more is very critical for a police officer. Mark's comment on protecting the spine and keeping that area free and clear is very important as well so that an officer can safely fall if needed. (anyone ever landing on something on their belt definately knows this) Addressing that during training is also essential for an LEO. It also sets things up differently in how you approach certain things. For an LEO or a civilian with a firearm on their waist you generally want to protect that and keep it unavailable for whomever you are dealing with. This can change what you will do as you do not want to inadvertantly present your tool to a criminal in a crucial moment. I find this very relevant when grappling and maintaining control of the side where your firearm is located. Real world self defense addresses this and that works not only for civilians who carry but also for LEO's as well.