Your buddy should try that "Have you fired a gun? no so you know jack shit" trick here.
And yes, my perspective is from the standpoint of someone who is more than old enough to be a father for 90% of the population here. There are consequences to breaking bylaws, severe ones.
Because pure luck was involved (and a lazy cop) is no reason to say it's okay.
Real gun knowledge? He would not reach far. If he's about your age, there are people here with more real experience with guns than he's had being simply alive.