Clarifying gun policy requires people working from consistent and credible data. Below are the most common sources for criminology, health and other databases used by policy researchers.

United States

Crime statistics

FBI Uniform Crime Statistics:

Injury and Death

Center for Disease Control Injury Prevention & Control: Data & Statistics (WISQARSTM):

Individual States


California Department Of Justice, crimes and crime clearance statitics:

Timeline for California gun control laws:





Clearance: The percentage of crimes for which charges against a defendant are made or otherwise adjudicated. “Clearance rate is calculated by dividing the number of crimes that are “cleared” (a charge being laid) by the total number of crimes recorded.”