Everything begins with the Federal Arbitration Act, 9 U.S.C. sections 1 through 16. Section 2 makes written arbitration agreements in contracts involving commerce valid, irrevocable and enforceable save upon such grounds as exist at law or in equity for the revocation of any contract. That phrase is the battleground: fraud, duress and unconscionability survive as defenses, while state rules singling out arbitration for hostile treatment are preempted under AT&T Mobility LLC v. Concepcion. The class waiver itself rests on Epic Systems Corp. v. Lewis, where the Supreme Court held that individualized arbitration agreements do not violate section 7 of the National Labor Relations Act and must be enforced as written.
Congress then carved out one category. The Ending Forced Arbitration of Sexual Assault and Sexual Harassment Act, Public Law 117-90, added chapter 4 to title 9 with effect from March 3, 2022. Under 9 U.S.C. section 402(a), at the election of a person alleging a sexual harassment or sexual assault dispute, no pre-dispute arbitration agreement and no pre-dispute joint-action waiver is enforceable in a case relating to that dispute. Section 402(b) gives that question to a court, not the arbitrator, even where the contract contains a delegation clause. The carve-out reaches disputes arising or accruing on or after the effective date, whatever the signature date, so a program written before 2022 and never revised is out of date. The provision appears in the Cornell Legal Information Institute entry for 9 U.S.C. 402 on predispute arbitration agreements.
One threshold question survives all of this. Section 1 exempts seamen, railroad employees and any other class of workers engaged in interstate commerce, and Bissonnette v. LePage Bakeries Park St., LLC confirmed the test looks at what the worker does, not the employer's industry. Delivery roles often fall outside the statute, so the agreement needs a state arbitration act fallback.