06). 87 Proposed Amendments, supra note 71, R. 12.1(b)(1)(B), at 3-4 (footnote omitted). 88 Fed. R. Crim. P. 12(d). 89 See, e.g., United States v. Causev, 834 F.2d 1277, 1282 (6th Cir. 1987) (noting that, in light of Rule 12(d), any penalty for violating the tule is "neither mandatory nor absolute" (qu