The following excerpt is from Thea v. Kleinhandler, 807 F.3d 492 (2nd Cir. 2015):
6 Whether a particular state rule of decision is "substantive" is a question of federal law. See Hanna v. Plumer, 380 U.S. 460, 46566, 85 S.Ct. 1136, 14 L.Ed.2d 8 (1965).
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