Psychology and the Fourth Amendment

The Fourth Amendment to the U.S. Constitution provides that people are to be “secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.” It further requires that warrants to perform such searches and seizures are based on probable cause with specific descriptions of what will be searched or seized. Supreme Court case law has contextualized this standard and applied a number of exceptions. As is often the case in the law, those standards and exceptions have psychological foundations and implications. The current chapter first examines the historical background of the Fourth Amendment. That history is replete with examples of the judiciary making psychological assumptions about people’s behavior. Next, we examine modern Fourth Amendment jurisprudence focusing on when a search or seizure triggers Fourth Amendment protections. In particular, we address the use of surveillance and technology (including trained canines) that seem to push the boundaries of the Fourth Amendment’s original intent. Finally, we address the issue of consenting to a search request because a search will not violate the Fourth Amendment if there is a valid consent. We detail empirical research addressing the psychological mechanisms underlying the validity and voluntariness of such consents.

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Authors and Affiliations

  1. Department of Psychology, University of Nebraska-Lincoln, Lincoln, NE, USA Eve M. Brank
  2. Department of Psychology, Scripps College, Claremont, CA, USA Jennifer L. Groscup
  1. Eve M. Brank