Impacts of “Three Strikes and You're Out” on Crime Trends in California and Throughout the United States

The impacts of Three Strikes on crime in California and throughout the United States are analyzed using cross-sectional time series analysis of state-level data from 1986 to 2005. The model measures both deterrence and incapacitation effects, controlling for preexisting crime trends and economic, demographic, and policy factors. Despite limited use outside California, the presence of a Three Strikes law appears to be associated with slightly but significantly faster rates of decline in robbery, burglary, larceny, and motor vehicle theft nationwide. Three Strikes also is associated with slower declines in murder rates. Although California's law is the broadest and most frequently used Three Strikes policy, it has not produced greater incapacitation effects on crime than other states' far more limited laws. The analyses indicate that the toughest sentencing policy is not necessarily the most effective option.