Cite as: 511 U. S. 244 (1994)
Scalia, J., concurring in judgments
had already been properly filed," ibid., and "the promulgation of a new jury trial rule would ordinarily not warrant retrial of cases that had previously been tried to a judge," ante, at 281, n. 34. It is hard to see how either of these refusals to allow retroactive application preserves any "vested right." " 'No one has a vested right in any given mode of procedure.' " Ex parte Collett, 337 U. S. 55, 71 (1949), quoting Crane v. Hahlo, 258 U. S. 142, 147 (1922).
The seemingly random exceptions to the Court's "vested rights" (substance-vs.-procedure) criterion must be made, I suggest, because that criterion is fundamentally wrong. It may well be that the upsetting of "vested substantive rights" was the proper touchstone for interpretation of New Hampshire's constitutional prohibition, as it is for interpretation of the United States Constitution's Ex Post Facto Clauses, see ante, at 275, n. 28. But I doubt that it has anything to do with the more mundane question before us here: absent clear statement to the contrary, what is the presumed temporal application of a statute? For purposes of that question, a procedural change should no more be presumed to be retroactive than a substantive one. The critical issue, I think, is not whether the rule affects "vested rights," or governs substance or procedure, but rather what is the relevant activity that the rule regulates. Absent clear statement otherwise, only such relevant activity which occurs after the effective date of the statute is covered. Most statutes are meant to regulate primary conduct, and hence will not be applied in trials involving conduct that occurred before their effective date. But other statutes have a different purpose and therefore a different relevant retroactivity event. A new rule of evidence governing expert testimony, for example, is aimed at regulating the conduct of trial, and the event relevant to retroactivity of the rule is introduction of the testimony. Even though it is a procedural rule, it would unquestionably not be applied to testimony already taken— reversing a case on appeal, for example, because the new
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