I have done no research on the figures yet.... First, you look at the negligent discharge of firearms rate (resulting in injury) for the area being considered. Then, compare the current rate to the rate in an area where this policy is already in practice. Afterwards, factor in the costs to implement and maintain and enforce the plan. Finally, realize the fact that no amount of traing will eliminate stupid people or stupid mistakes. My guess is that people unintentionally injured by negligent shooting are about the same here as any state that requires training. Someone look it up and tell me im wrong. My guess is less than a 1.5% difference.