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18 U.S.C. § 1964(c) (1994). In Holmes, 503 U.S. at 268, the Supreme Court stated that a plaintiff's standing to sue under RICO requires 'a showing that the defendant's violation not only was a 'but for' cause of his injury, but was the proximate cause as well.' To determine in a given case whether proximate cause is present, common law principles are applied. See id. at 267-68 (explaining that statutory standing under RICO encompasses common law principles of proximate cause because Congress implicitly incorporated those principles into the RICO statute) (citing Associated Gen. Contractors, Inc. v. Carpenters, 459 U.S. 519, 532-33, ...