Marcus v. BMW of N. Am. LLC

We previously wrote about the Third Circuit’s decision in Carrera v. Bayer Corp., which reversed a district court’s class-certification order because there was no reliable way to ascertain class membership—indeed, no way to identify who was a member of the class aside from a class member’s own say-so. Last week, the full Third Circuit denied (pdf) the plaintiff’s request to rehear the case en banc over the dissent of four judges. The clear message of Carrera is that when plaintiffs file class actions that have no hope of compensating class members for alleged wrongs because the class members can’t be found, courts should refuse to let these actions proceed.

As we discuss below, the denial of rehearing is significant in itself, given the concerted efforts by Carrera and his amici to draw attention to the case. But what might be most significant about this latest set of opinions is what even the dissenting judges did not say.


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The “ascertainability” requirement for class certification is a crucial safeguard for both defendants and absent class members. There is some debate about its origin: some courts have held that it is implicit in Rule 23 that class members must be readily identifiable; others find ascertainability to be rooted in Rule 23(a)(1)’s numerosity mandate or Rule 23(b)(3)’s requirement that a class action be superior to other methods for resolving the controversy. Either way, courts agree that a class is ascertainable only if the class definition is sufficiently definite to make it administratively feasible for the court to determine by reference to objective criteria whether a particular person is a member of the putative class.

In two recent opinions—Hayes v. Wal-Mart Stores, Inc. (pdf), 2013 WL 3957757 (3d Cir. Aug. 2, 2013), and Carrera v. Bayer Corp., 2013 WL 4437225 (3d Cir. Aug. 21, 2013)—the Third Circuit vacated class certification orders because the plaintiffs hadn’t met their burden of proving that class members were ascertainable. These decisions are a goldmine for class action defendants: They provide great examples of the ascertainability requirement in action.


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