Cite as: 511 U. S. 244 (1994)
Opinion of the Court
actment would need to be retried and the possibility that employers would be liable for punitive damages for conduct antedating the Act's enactment. Purely prospective application, on the other hand, would prolong the life of a remedial scheme, and of judicial constructions of civil rights statutes, that Congress obviously found wanting. Given the high stakes of the retroactivity question, the broad coverage of the statute, and the prominent and specific retroactivity provisions in the 1990 bill, it would be surprising for Congress to have chosen to resolve that question through negative inferences drawn from two provisions of quite limited effect.
Petitioner, however, invokes the canon that a court should give effect to every provision of a statute and thus avoid redundancy among different provisions. See, e. g., Mackey v. Lanier Collection Agency & Service, Inc., 486 U. S. 825, 837, and n. 11 (1988). Unless the word "otherwise" in § 402(a) refers to either § 402(b) or § 109(c), she contends, the first five words in § 402(a) are entirely superfluous. Moreover, relying on the canon "[e]xpressio unius est exclusio alterius," see Leatherman v. Tarrant County Narcotics Intelligence and Coordination Unit, 507 U. S. 163, 168 (1993), petitioner argues that because Congress provided specifically for prospectivity in two places (§§ 109(c) and 402(b)), we should infer that it intended the opposite for the remainder of the statute.
Petitioner emphasizes that § 402(a) begins: "Except as otherwise specifically provided." A scan of the statute for other "specific provisions" concerning effective dates reveals that §§ 402(b) and 109(c) are the most likely candidates. Since those provisions decree prospectivity, and since § 402(a) tells us that the specific provisions are exceptions, § 402(b) should be considered as prescribing a general rule of retroactivity. Petitioner's argument has some force, but we find it most unlikely that Congress intended the introductory clause to carry the critically important meaning petitioner assigns it. Had Congress wished § 402(a) to have such a de-
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