California Legal Brief

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J.O. v. Super. Ct. 5/28/26 SC

Case No.: S287285
Filed: May 28, 2026
Court: Supreme Court of California
Justices: Chief Justice Guerrero, Justices Corrigan, Liu, Kruger, Evans, Groban (author), and Brown
→ View Original Opinion (PDF)

The Rule of J.O. v. Superior Court is that if a party timely objects to a Code of Civil Procedure section 170.6 motion and makes a prima facie showing that the motion's proponent is lodging bad faith blanket challenges against a judge, a court may look beyond the section 170.6 affidavit or oral statement and inquire into the legitimacy of the party's assertions of prejudice, under circumstances where bad faith blanket abuses of section 170.6 materially impair the judiciary's constitutional function to effectively administer justice.

Appeal from order denying opposition to "blanket 170.6" motion in Superior Court, San Joaquin County.

Petitioner Appellant was J.O. — the conservatee subject to conservatorship proceedings who objected to County Counsel's alleged blanket section 170.6 challenges.

Respondent was The Superior Court of San Joaquin County, with Real Party in Interest San Joaquin County Public Conservator — the conservator represented by County Counsel who allegedly filed over 325 section 170.6 motions against Judge Guy Castillo in less than four months.

The suit sounded in conservatorship proceedings and judicial administration/separation of powers doctrine.

The key substantive facts leading to the suit were Judge Guy Castillo admonished a deputy county counsel attorney for improper conduct on or before May 17, 2024, after which County Counsel allegedly began filing section 170.6 motions against Judge Guy Castillo in all conservatorship cases assigned to her. Petitioner's counsel estimated approximately 325 such motions were filed between May and August 2024, ultimately forcing Judge Guy Castillo's reassignment from the mental health and conservatorship department to a different department handling misdemeanors, traffic, small claims, unlawful detainers, restraining orders, and expungement cases.

The procedural result leading to the Appeal: The trial court denied petitioner's opposition to County Counsel's "blanket 170.6" motion, citing Solberg v. Superior Court (1977) 19 Cal.3d 182, ruling that blanket abuses of section 170.6 were immune from as-applied constitutional challenges on separation of powers grounds.

The key question(s) on Appeal: 1. Whether Solberg's conclusion that blanket abuses of section 170.6 do not violate separation of powers should be reconsidered in light of dramatic changes to California's judiciary since 1977; 2. Whether courts may inquire into the legitimacy of section 170.6 challenges when there is evidence of bad faith blanket abuse; 3. What procedural framework should govern such inquiries.

The Appellate Court held that Solberg's reasoning is no longer viable given the substantial changes to California's judicial system since 1977, including increased caseloads, budget constraints, judicial shortages, proliferation of specialty courts, and sweeping changes in substantive law requiring judicial specialization. Bad faith blanket abuses of section 170.6 can now "materially impair" the judiciary's core constitutional function to effectively administer justice. The Court overruled Solberg to the extent it barred as-applied constitutional challenges to blanket abuses, establishing a three-step Batson-like procedure requiring: (1) timely objection and prima facie showing of bad faith blanket policy; (2) burden shifting to the movant to provide good faith explanation; (3) hearing before different judge to determine legitimacy of challenges.

The case is inapplicable when section 170.6 challenges are made in good faith based on legitimate belief in judicial prejudice in specific cases, when challenges are sporadic rather than systematic, when the challenged judge has not been assigned to a specialized calendar or substantial portion of cases, or when no party timely objects to the section 170.6 motion.

The case leaves open whether a judge may sua sponte initiate inquiry into section 170.6 motions without party objection, the complete scope of factors that may establish prima facie showing of bad faith blanket policy, detailed procedural requirements for conducting hearings on challenged motions, and application to smaller jurisdictions with limited judicial resources.

Counsel

For Appellant: [Not determinable from opinion text]

For Respondent: [Not determinable from opinion text]

Amicus curiae: California Judges Association, California District Attorneys Association, California Public Defenders Association, Law Offices of Marsanne Weese

Practice Area Tags

civil judicial administration separation of powers due process administrative law conservatorship probate constitutional law judicial disqualification court procedure government liability judicial independence
This brief was generated by AI informed by the law practice of Ted Broomfield Law and has not been reviewed for accuracy. It is provided for informational purposes only and does not constitute legal advice.