Issue: Whether failure to cite relevant authority in support of appellate argument establishes waiver.
¶11 … But Noble cites no authority requiring a tape recording, a transcript, or a signed statement to show the falsity of a statement. In State v. Shaffer, 96 Wis. 2d 531, 545-46, 292 N.W.2d 370 (Ct. App. 1980), we said that arguments unsupported by relevant authority were inadequate and do not comply with WIS. STAT. § 809.19(1)(e), and that we would refuse to consider such arguments in the future. If there is relevant authority holding that only evidence that is tape recorded, transcribed, or signed by a defendant is sufficient to support a perjury conviction, Noble has failed to cite it. We see no reason to depart from Shaffer now.