Here is an interesting article from Rob Morse for AmmoLand (www.ammoland.com)
Along with these new training options comes countless trainers who, most often, are well intentioned. Others however can be in it for the almighty dollar or the ego pump. No matter what the reason, too many trainers, as we know, are not applying Best Practices to the training process. There are very real physical, psychological and legal issues to be aware of, and many trainers are not up to speed on any of them. Haphazard training is occurring at an alarming rate, both within the civilian and the institutional communities.
Give the article a read by clicking the link below.