Another study examined newspaper reports of gun incidents in Missouri, involving police or civilians. In this study, civilians were successful in wounding, driving off, capturing criminals 83% of the time, compared with a 68% success rate for the police. Civilians intervening in crime were slightly less likely to be wounded than were police. Only 2% of shootings by civilians, but 11% of shootings by police, involved an innocent person mistakenly thought to be a criminal. [145]
The Missouri research does not prove that civilians are more competent than police in armed confrontations. Civilians can often choose whether or not to intervene in a crime in progress, whereas police officers are required to intervene. Being forced to intervene in all cases, police officers would naturally be expected to have a lower success rate, and to make more mistakes. Attorney Jeffrey Snyder elaborates:
Rape, robbery, and attempted murder are not typically actions rife with ambiguity or subtlety, requiring special powers of observation and great book-learning to discern. When a man pulls a knife on a woman and says, "You're coming with me," her judgment that a crime is being committed is not likely to be in error. There is little chance that she is going to shoot the wrong person. It is the police, because they are rarely at the scene of the crime when it occurs, who are more likely to find themselves in circumstances where guilt and innocence are not so clear-cut, and in which the probability for mistakes is higher. [146]
In addition, the Missouri study was not restricted to "carry" situations, but also included self-defense in the home. Persons using a gun to defend their own home, who know its layout much better than does an intruder, might be expected to have a higher success rate than would persons using a gun in a less familiar public setting.