[7][8] In November 1948, he was president of the conference of California judges, and led a study a code conduct of judicial proceedings.
[9] In February 1949, Chief Justice Phil S. Gibson appointed Peters to a two-year term on the State Judicial Council.
[10] His notable cases on the appellate bench include a September 1958 decision holding San Benito County's "right to work" ordinance is "unconstitutional and contrary to the state's public policy.
[12] A liberal lion on the court led by Roger J. Traynor,[13][14] Peters' notable cases include In People v. Belous (1969),[15] a landmark abortion decision that protected the constitutional right of a woman to control her own body.
In December 1967, he wrote the majority opinion striking down the loyalty oath required in the state constitution of public employees.