Law Commons^™

Null Preemption, Jonathan R. Nash

Faculty Articles

This Article proceeds as follows. In Part I, I introduce the concept of null preemption. I discuss in greater detail the case of regulation of motor vehicle tailpipe greenhouse-gas emissions as a case study of null preemption. In Part II, I explore the contours of null preemption, and then describe, and distinguish among, several paradigmatic settings in which null preemption may arise.

In Part III, I consider the normative case for null preemption. I conclude that the case is narrow. I also consider concerns of institutional choice and argue that even those who generally defend agency preemption of state law …

The Irrepressible Influence Of Byrd, Richard D. Freer, Thomas Arthur

Faculty Articles

We set forth four interrelated theses in this article. First, Byrd is the only Supreme Court case since Erie itself to discuss all three of the core interests balanced, expressly or not, in every vertical choice of law case. Second, because Hanna's "twin aims" test ignores two of these three core interests, it cannot adequately serve as the standard for cases under the Rules of Decision Act ("RDA"). This fact is evidenced by the Court's eschewing the twin aims test in cases, like Gasperini, where state and federal interests must be accommodated. Third, as all three opinions in …

How Not To Lie With Judicial Votes: Misconceptions, Measurement, And Models, Daniel E. Ho, Kevin M. Quinn

Faculty Articles

In Part I, we describe the formal spatial theory often invoked to justify the statistical approach. While spatial theory has the nice feature of synthesizing theory and empirics, legal scholars may remain skeptical of its strong assumptions. Fortunately, measurement models can be illuminating even if the spatial theory is questionable.

To illustrate this, Part II provides a nontechnical overview of the intuition behind measurement models that take merits votes as an input and return a summary score of Justice-specific behavior as an output. Such scores provide clear and intuitive descriptive summaries of differences in judicial voting.

Confusion abounds, however, and …

Did A Switch In Time Save Nine?, Daniel E. Ho, Kevin M. Quinn

Faculty Articles

Franklin Delano Roosevelt’s court-packing plan of 1937 and the “switch in time that saved nine” animate central questions of law, politics, and history. Did Supreme Court Justice Roberts abruptly switch votes in 1937 to avert a showdown with Roosevelt? Scholars disagree vigorously about whether Roberts’s transformation was gradual and anticipated or abrupt and unexpected. Using newly collected data of votes from the 1931–1940 terms, we contribute to the historical understanding of this episode by providing the first quantitative evidence of Roberts’s transformation. Applying modern measurement methods, we show that Roberts shifted sharply to the left in the 1936 term. The …

Mapp V. Ohio Revisited: A Law Clerk's Diary, Polly J. Price

Faculty Articles

The 1960 Supreme Court Term laid the groundwork for the subsequent revolution in the relationship between state and federal law accomplished by the Supreme Court under Chief Justice Earl Warren. The "most famous search and seizure case in American history" - Mapp v. Ohio - would be decided that Term. Mapp held that the Fourth Amendment's protection against "unreasonable searches and seizures" required the exclusion of evidence found through an illegal search by state and local police officers, extending to the states a rule that had previously applied only to federal law enforcement. Mapp became a pivotal chapter in the …