Policy Wonk

California's Three Strikes law

Headline result
13.9% → 12.8%
share of felony arrests by strike-eligible offenders, before vs after law
Quasi-experimental
Implemented by
State of California
Type
State / regional government
Where
United States
Region
North America
When
1994–2012
Evidence
Quasi-experimental

The challenge

After high-profile crimes, voters wanted tougher sentences for repeat offenders.

The case

Passed in 1994, California's Three Strikes law required sentences of 25 years to life for people with two prior serious or violent felonies who were convicted of any new felony, even a minor one. The prison population grew and aged, at great cost. Studies found at most a modest deterrent effect, and some found none, while the cost per crime prevented was very high. Voters scaled the law back in 2012 so the third strike must be serious or violent. Zimring's team found people with one or two strikes made up 13.9 percent of adult felony arrests in three cities before the law and 12.8 percent after.

Why it didn't work

Blanket long sentences are an expensive way to cut crime, because people age out of offending while staying in prison. Laws written in response to single high-profile crimes often overreach.

Sources