The NRA may make the rules that NRA certified instructors have to follow when teaching NRA sanctioned classes, but they cannot make the rules that govern how classes must be conducted in order for individuals to obtain a state license to carry a concealed handgun. They also cannot decide or regulate qualifications for anyone who wishes to become an instructor in a concealed carry class in North Carolina.
That's true, but the NRA does more or less set what amounts to an industry standard for training and safety protocols.
Consequently, when an instructor decides to hold a session in a classroom and allows all the students to show up with their own guns and ammo and someone inevitably gets shot, the instructor will get sued and lose, and probably discover that his or her insurance company won't pay the claims as the instructor violated the industry standards.
Then of course there are the "reasonable person" and common sense tests that the instructor will have failed.
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Personally, I would not pay good money to attend a class by an instructor who lacked the common sense to see where that kind of training policy was going to lead. I'd have to question the value and validity of every thing else he said, as after all, if you want to stay out of jail, the use of lethal force requires sound judgement.
One of the primary issues you have to consider when it comes to the use of lethal force is that just because the situation you are in, or at least as you perceive it to be, may meet a strict legal minimum, that does not automatically make it a good idea to go ahead and shoot. You can see evidence of the problems that kind of logic is causing for police officers all over the country who are applying a legal minimum threshold with no regard to their contributing actions in escalating events or to the less lethal means they could have chosen.
For a concealed carry permit hold, who is not charged with the duties of a police officer to go looking for trouble, the situation is even more precarious. In that regard, I've prefer to have an instructor who is solid grounded in the concepts of common sense and what a reasonable person would do, not a 2A fanatic who'd, for example, argue George Zimmerman was correct in his approach as it was strictly legal under the law. Life is hard enough as it is without doing stupid stuff.