Waiver of Issue on Appeal by Failing to Argue It (as Opposed to Asserting It) in Opening Brief

From Mullarkey v. Tamboer, 2008 U.S. App. LEXIS 16238 (3d Cir. July 31, 2008):

Furthermore, while Mullarkey asserted in his opening brief that he could seek a civil remedy for the Tamboers' violation of the federal RICO statute, he failed to present any argument in support. Thus, we deem this claim to be waived. Laborers' Intern. Union of N. Am., AFL-CIO v. Foster Wheeler Energy Corp., 26 F.3d 375, 398 (3d Cir. 1994) (citation omitted) ("An issue is waived unless a party raises it in its opening brief, and for those purposes 'a passing reference to an issue . . . will not suffice to bring that issue before this court.'"); United States v. Pelullo, 399 F.3d 197, 222 (3d Cir. 2005) ("It is well settled that an appellant's failure to identify or argue an issue in his opening brief constitutes waiver of that issue on appeal.").

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