Ambiguity in statutory text can invoke two interpretive regimes. Ambiguity in a criminal statute invokes the rule of lenity that says that if a criminal statute is ambiguous (or, sometimes, grievously ambiguous) the statutory ambiguity must be interpreted in the criminal defendant’s favor. Ambiguity in a statute potentially subject to Chevron deference to an agency interpretation is interpreted consistent with the Chevron-entitled agency interpretation if it is reasonable (permissible). Both interpretive regimes turn on ambiguous statutory text.
The question I address in this blog is what ambiguity means for both lenity and Chevron deference. The only thing that I am sure of is that ambiguity in either context has no litmus test, thus is itself ambiguous. As I note in The Report of the Death of the Interpretive Regulation Is an Exaggeration 75 n. 296 (SSRN December 14, 2021), here.
n. 296 The word ambiguous in deference jurisprudence may be ambiguous. E.g., Aditya Bamzai, Delegation and Interpretive Discretion: Gundy, Kisor and the Formation of Future Administrative Law, 133 Harvard L. Rev. 164, 187 n. 140 (2019) (“The question of how to identify ‘ambiguity’ is a long-running one in both administrative law and elsewhere,” citing scholarly discussions); Brett M. Kavanaugh, Book Review: Fixing Statutory Interpretation, 119 Harv. L. Rev. 2118, 2118-2119 (2016) (“judges often cannot make that initial clarity versus ambiguity decision in a settled, principled, or evenhanded way”); and Ryan D. Doerfler, The “Ambiguity” Fallacy, 88 Geo. Wash. L. Rev. 1110 (2020) (“‘ambiguity,’ is critically ambiguous.”)
Ambiguity in the ambiguity concept also infects lenity. In Wooden v. United States, 595 U. S. ____ 2022 U.S. LEXIS 1421 (3/7/22), S.Ct. here and GS here, Justices Kavanaugh and Gorsuch, in concurring opinions, weighed in on the issue in ways that evoke the ambiguity discussion for Chevron deference and may offer some guidance in Chevron deference.
I start with Justice Gorsuch’s discussion on p. 9 of his concurring opinion which starts here. Justice Gorsuch starts with a complaint about the gloss sometimes added to the lenity discussion that the ambiguity must not only be ambiguous but also must be “grievously ambiguous.” I think he does a pretty good job in demolishing the spurious notion that there are two categories of ambiguity for lenity purpose – grievous in which lenity applies and non-grievous in which lenity does not apply. Lenity applies where there is ambiguity, period.
This still does not help in determining what ambiguity is. Is it just that the judge knows it when he or she sees it. Justice Kavanaugh discusses that issue in his concurring opinion starting here. Basically, Justice Kavanaugh argues that ambiguity in statutory interpretation for lenity purposes is a rare phenomenon. Evoking the Chevron / Auer concepts hinging on ambiguity, Justice Kavanaugh says (p. 2 of concurring opinion):