Following the Supreme Court’s game-changing decision in Wal-Mart Stores, Inc. v. Dukes, 131 S. Ct. 2541, 2551 (2011), courts have struggled to determine the level and nature of proof a class plaintiff must present at the class certification stage. This is especially so when it comes to the requirements related to commonality: that there be questions of law or fact common to the class and that the common questions predominate over any questions affecting only individual class members. Fed. R. Civ. P. 23(a)(2), (b)(3). Recently, Chief District Judge George King of the Central District of California refused to certify a wage-and-hour class on the ground that plaintiff was unable to establish commonality. See Pedroza v. PetSmart, Inc., No. ED CV 11-298-GHK (DTBx) (C.D. Cal. Jan. 28. 2013) (minute order).  This detailed order offers many great lessons for wage-and-hour actions brought on a class basis.…

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