By Ainsley L. Mitchum, Sam Stevens, and Bayliss J. Camp

The present study builds upon prior work by Marowitz (1996) by examining the crash and recidivism risk of alcohol-focused versus drug-involved driving under the influence (DUI) offenders. Although drug-involved DUI offenders remain a relatively small proportion of all DUI offenders, this proportion is rising, as is the proportion of impaired-driving fatal crashes involving drugs. Using a cohort of offenders arrested during calendar years 2014 through 2017, comparisons were drawn for the one-year periods pre- and post-arrest. Drug-involved offenders tended to have more problematic driving histories in the year prior to their index offense, as compared to alcohol-focused offenders. Even taking account of these differences in pre-arrest behavior, drug-involved offenders continued to have more problematic driving in the year subsequent to their index offense: they were twice as likely to be involved in a crash, and approximately 30% more likely to recidivate. A particularly powerful predictor of recidivism was whether or not a pre-conviction administrative per se (APS) license suspension – only available in instances where an offender is above the per se blood alcohol concentration (BAC) limit, or refuses a chemical test – was imposed. Offenders convicted of a DUI offense, but against whom no APS license action was initiated, were more than three times as likely to recidivate compared to offenders against whom an APS action was taken.

Sacramento: California Office of Traffic Safety; 2025. 78p.

By Hannah E. Meyers

In November 2014, California voters approved a criminal justice reform measure, Proposition 47 (“Prop 47”), with almost 60% support. Ten years later, California voters are now considering rolling back some of its soft-on-crime policies. Prop 47 identified six “petty” crimes—grand theft, larceny, personal drug use, forgery, and two types of check fraud—and reclassified them. It downgraded these crimes, including thefts with property values under $950 and illegal drug possession for personal use, from felonies to misdemeanors. This paper presents a data-based argument on how Prop 47 shifted dynamics in both offender behavior and prosecutorial decision-making that damaged public safety and public health. Representative data from Riverside, one of California’s largest counties, suggest that Prop 47 increased re-offending, including serious felony re-offending, detention times, failures to appear in court, warrants issued on offenders, case dismissals in conjunction with plea deals, and the persistence levels of drug and theft offenders. Additional data collected from both Riverside and San Bernardino law-enforcement agencies show a significant drop in sentencing and in arrests, due partly to the diminished incentive for businesses to promptly report thefts. These shifts have also resulted in fewer defendants participating in in-custody drug treatment programs or other mandatory, supervised services because the incentives for doing so (avoiding prosecution and significant sentences) have evaporated. And, as California business owners can attest, reducing the cost of repeatedly committing theft removes the incentive for offenders to change their behavior. This has fueled increases in organized retail theft and fencing rings. Prop 47 also strained the resources of counties, by increasing the number of defendants sentenced to serve in overcrowded jails rather than prison.

New York: Manhattan Institute, 2024. 20p.

By Magnus Lofstrom and Brandon Martin

California’s violent crime rate rose somewhat in 2023 and remains above its pre-pandemic level; the statewide property crime rate fell slightly. Both rates vary widely across crime categories and regions.

Public Policy Institute of Californiam 2024, 2p.

By Benjamin Artz and  David M. Welsch:

We employ a unique 10-year panel dataset from California to examine both the effect crime has on homelessness as well as the effect homelessness has on crime. Our main estimator accounts for endogeneity by incorporating dynamics, controlling for time-invariant unobserved heterogeneity, and relaxing the strict homogeneity assumption for our key variables of interest. We find strong evidence that regions experiencing increases in property crime, but not violent crime, should expect a practically significant, 2024. 69p..in homelessness, whereas increases in homelessness increase the number of violent crimes, but not property crimes. Robustness and falsification checks confirm the results.

Bonn:  Institute of Labor Economics - IZA, 2024. 49p.