Ninth Circuit Reverses District Court, Bars Non-Mutual Estoppel from Invalidating Aya Healthcare Arbitration Agreements

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Why it matters

The Ninth Circuit has reversed a district court decision that used collateral estoppel to invalidate 255 arbitration agreements in a wage-and-hour dispute against Aya Healthcare Services, a travel nursing agency. In O'Dell v. Aya Healthcare Services, Inc. (No. 25-1528), the appeals court held that the lower court's selective application of prior arbitral rulings—taking only the unfavorable findings to block arbitration for opt-in employees—violated the Federal Arbitration Act. Writing for the panel, Judge Eric C. Tung emphasized that the FAA requires arbitration agreements to be enforced as written based on individualized consent, not through collateral estoppel or other non-contractual defenses.

The underlying dispute involved four named plaintiffs pursuing arbitration over breach of contract, fraudulent inducement, and wage-and-hour violations. Two arbitrators found the agreements enforceable; two found them unconscionable. The district court then used only the unfavorable rulings to block arbitration for 255 additional employees seeking to opt into the action. The Ninth Circuit found this approach transformed bilateral arbitrations into an unauthorized class-like proceeding that lacked the procedural safeguards required for such actions.

Employers should note this decision as a significant reinforcement of arbitration agreements against sophisticated avoidance tactics. The ruling makes clear that prior arbitral outcomes cannot be weaponized to invalidate agreements for non-parties, and that courts cannot circumvent the FAA's individualized consent requirement through estoppel doctrine. For companies facing employment litigation, the decision strengthens the enforceability of arbitration clauses even when earlier arbitrations yield mixed results.

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