Despite being only a private detective, Magnum is involved in the deaths of at 15 people during the run of the series. Yet he never faces any criminal prosecution for this, even though at least three of these events were clearly cases of premeditated murder.
Hawaii has some of the most stringent firearm laws in the United States. It is nearly impossible to obtain an open or concealed carry handgun permit, and as of 2017, less than 200 people on all of the islands of the state, not including law enforcement officers, have an open or concealed carry handgun permit. Yet the entire series shows all of the major characters both armed with handguns and freely carrying and using them. This would not be possible.