By Pieter T. M. Desmet, Jef De Mot & Michael Faure

We examined whether jurors who know that a prosecutor has a high conviction rate are more inclined to convict a defendant than jurors who know that the prosecutor has a low conviction rate. Using simulated criminal cases, we conducted two experimental studies with jury-eligible participants. Study 1 (N = 200) tested whether information about prior conviction rates (high or low) affected jurors’ estimations of the probability of guilt in the context of a robbery. Study 2 (N = 205) used another criminal trial context (murder) and another dependent variable (dichotomous guilty/not guilty verdicts). Study 2 also incorporated jury instructions on the reasonable doubt standard and included a control condition in which no information regarding the conviction rate was provided. In both studies, jurors in the high conviction rate treatment were significantly more likely to convict the accused than jurors in the low conviction rate treatment. When jurors are aware of a prosecutor's prior conviction rates, a self-reinforcing cycle may arise in which conviction rates determine conviction rates.

Crim Law Forum 34, 209–235 (2023).

By George Frederick Arnold.

2d ed., Rev. “This work does not claim to be an original treatise on either Psychology or Law.”

Calcutta: Thacker, Spink, & Co., 1913. 607p.

By Hugo Munsterberg.

Essays on Psychology and Crime. “There are about fifty psychological laboratories in the United States alone. The average educated man has hitherto not noticed this. If he chances to hear of such places, he fancies that they serve for mental healing, or telepathic mysteries, or spiritistic performances. What else can a laboratory have to do with the mind? Has not the soul been for two thousand years the domain of the philosopher? What has psychology to do with electric batteries and intricate machines? Too often have I read such questions in the faces of visiting friends who came to the Harvard Psychological Laboratory in Emerson Hall and found, with surprise, twenty-seven rooms over spun with electric wires and filled with chronoscopes and kymographs and tachistoscopes and ergographs, and a mechanic busy at his work.”

New York: Doubleday, 1908. 269p.