The D.C. Circuit recently deepened a circuit split over whether district courts may certify a “fail-safe” class. In In re White, 64 F.4th 302 (D.C. Cir. 2023),the D.C. Circuit agreed that fail-safe classes are generally improper, but rejected the views of other circuits that categorically forbid such classes . Instead of what it described as an “extra-textual” limitation on class certification, the D.C. Circuit held that the existing requirements of Rule 23 (and a district court’s discretion to alter proposed class definitions) should be used to prevent certification of fail-safe classes.