“It will be your duty…:” The Psychology of Criminal Jury Instructions

The right to trial by jury granted by the Constitution is one of the cornerstones of American democracy. Jury trials allow the public to participate in the judicial process, which prevents the process from being unfairly used by the government. Without properly understanding the relevant law, jurors are unable to carry out their duties effectively, which can result in unjust outcomes such as innocent defendants being convicted. Judges give jurors instructions to help them understand how to apply the law to the case at hand. The chapter begins by evaluating jurors’ general comprehension of jury instructions, and then presents additional sections on special types of criminal jury instructions, including death penalty instructions, instructions on how to evaluate eyewitness testimony, curative/limiting instructions, joinder instructions, Allen (dynamite) charges, and jury nullification instructions. Each section provides an overview of the law regarding each particular topic, presents the psychological research available on the topic, and provides recommendations on how to apply research findings to improve the effectiveness of the instructions.

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Authors and Affiliations

  1. University of Nevada, Reno, Mailstop 313, National Judicial College 114, Reno, NV, 89557, USA Mauricio J. Alvarez
  2. Criminal Justice Department and Interdisciplinary Social Psychology PhD Program, University of Nevada, Reno, NV, USA Monica K. Miller
  3. Department of Psychology, University of Nebraska-Lincoln, 335 Burnett Hall, Lincoln, NE, 68588-0308, USA Brian H. Bornstein
  1. Mauricio J. Alvarez