Proposition 66 was a California ballot proposition on the November 8, 2016, ballot to change procedures governing California state court challenges to capital punishment in California, designate superior court for initial petitions, limit successive petitions, require appointed attorneys who take noncapital appeals to accept death penalty appeals, and exempt prison officials from existing regulation process for developing execution methods.
The intention of Proposition 66 was to speed up the process of capital trials and executions. Proposition 66 was approved by voters in the November general election, with 51.1% voting to speed up executions.Proposition 62, which would have abolished the death penalty in California, was rejected by voters in the same election, with 53.1% voting against it. If voters had passed both Proposition 62 and Proposition 66, then the measure with the most "Yes" votes would have taken effect.
The measure constitutionality was upheld 5-2 on August 24, 2017, though the state supreme court held that one provision requiring it to decide direct appeals of capital cases within five years was directive rather than mandatory. The court ordered that Prop 66 take effect after this decision becomes final.