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73 Stan. L. Rev. 637 (2021)
An Empirical Assessment of Pretextual Stops and Racial Profiling

handle is hein.journals/stflr73 and id is 661 raw text is: ARTICLE

An Empirical Assessment of
Pretextual Stops and Racial Profiling
Stephen Rushin & Griffin Edwards*
Abstract. This Article empirically illustrates that legal doctrines permitting police
officers to engage in pretextual traffic stops may contribute to an increase in racial
profiling. In 1996, the U.S. Supreme Court held in Whren v. United States that pretextual
traffic stops do not violate the Fourth Amendment. As long as police officers identify an
objective violation of a traffic law, they may lawfully stop a motorist-even if their actual
intention is to use the stop to investigate a hunch that by itself does not amount to
probable cause or reasonable suspicion.
Scholars and civil rights activists have sharply criticized Whren, arguing that it gives
police officers permission to engage in racial profiling. But social scientists have struggled
to empirically evaluate how Whren has influenced police behavior.
A series of court decisions in the State of Washington presents an opportunity to test the
effects of pretextual-stop doctrines on police behavior. In the years since the Whren
decision, Washington has experimented with multiple rules that provide differing levels
of protection against pretextual stops. In 1999, the Washington Supreme Court held in
State v. Ladson that the state constitution barred police from conducting pretextual traffic
stops. However, in 2012, the court eased this restriction on pretextual stops in State v.
Arreola.
Exploiting a dataset of 8,257,527 traffic stops conducted by the Washington State Patrol
from 2008 through 2015, we carry out difference-in-differences and triple-difference
analyses to assess whether the Arreola decision increased traffic stops among drivers of
color relative to white drivers. We find that the Arreola decision is associated with a
statistically significant increase in traffic stops of drivers of color relative to white drivers.
Further, we find this increase in traffic stops of drivers of color is concentrated during
Stephen Rushin is an Associate Professor at Loyola University Chicago School of Law.
Ph.D., J.D., University of California, Berkeley. Griffin Edwards is an Associate Professor
at the University of Alabama, Birmingham. Ph.D., Emory University. This paper
benefited from workshops at Vanderbilt Law School, Florida International University
College of Law, and Loyola University Chicago. We thank our colleagues from across the
country who provided us with helpful feedback and ideas related to this paper, especially
Christy Lopez, Tracey Maclin, and Jordan Blair Woods. We also thank the editorial staff
at the Stanford Law Review, especially Brett Oliver Parker and Hannah K. Song.

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