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On a related point, some lasers (Crimson Trace add-ons) are operated when you grip the pistol, so it is almost impossible to operate the gun properly without activating the laser. I tell my students (a few days before class) that if they have a laser like that, to put a piece of duct tape over the lens. They shouldn't have to take the laser off for the test. We're outdoors, so they wouldn't be able to see it, anyway.