Washington and California implemented three strikes laws during the 1993-1995 period. Washington's law requires a life term in prison without the possibility of parole for a person convicted for the third time of statutorily listed most serious offenses. California's law is different from Washington's law in three important ways: (1) only the first two convictions have to be from the State's list of "strikeable" offenses and any subsequent felony can count as the third strike; (2) persons convicted of a felony who have a prior conviction for a strikeable offense are to be sentenced to twice the term they would otherwise receive; and (3) a third striker has the possibility of eventually being released after serving a minimum imprisonment of 25 years. Three strikes laws have differing impacts on local courts and jails and on State prison systems. Even so, certain factors are associated with three strikes laws passed in 24 States that concern authorization, pre-existing statutes that target repeat violent offenders, an increased period of incarceration, and reduced judicial sentencing discretion. Additional research is recommended to study the effect of three strikes laws on the criminal justice process.