Gun control laws, in turn, are intended to reduce crime and violence rates by restricting the availability of firearms among persons believed to be at higher risk of committing acts of violence. Although some laws hypothetically might do this by reducing gun levels in the general population,neither the federal government nor any state has ever banned the ownership of guns or even any large subset of guns, such as handguns. Further, prior research indicates that existing laws have no measurable effect on overall gun ownership levels in the population as a whole (Kleck & Patterson, 1993). Instead, gun laws are intended to block acquisition, possession, and criminal use of guns by members of high-risk subsets of the population, such as convicted criminals, mentally ill persons, alcoholics, or drug addicts.