Gun-mounted tactical flashlights and accidental shootings

Many modern handguns have rails and other features that allow attachment of accessories such  as small flashlights.  Police frequently use gun mounted tactical flashlights.   Case have been reported where the officer alleged that the accidentally hit the trigger instead of the on-switch for the light.  There is no reliable data on how often this occurs,  It has, however,  become an issue in many cities, including Denver.