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Scientific jury selection (SJS) is the use of a survey to decide which jurors to favor in a trial. Prior to the 1970s, jury selection was done by attorneys based on their hunches. The new quantitative method was welcomed enthusiastically by trial attorneys. Social scientists were more reserved. SJS led to the employment of social scientists as trial consultants. This entry describes traditional jury selection as conducted by attorneys, reviews the origin of SJS, presents an example of a 2003 survey used in Florida to implement SJS, and examines evidence on the utility of SJS.

Voir dire is the process at the beginning of a trial when prospective jurors, called venirepersons, are examined verbally to determine their fitness for service as jurors in a particular trial. An unlimited number of venirepersons can be excused for cause—that is, found unfit by the trial judge for reasons of incompetence or prejudice. Venirepersons are also excused peremptorily, that is, by the attorneys without stated reason. The rules for using peremptory excusals vary by jurisdiction and preferences of trial judges. Judges differ widely in the questions they ask or allow the attorneys to ask. Some judges allow venirepersons to complete trial-specific questionnaires constructed by the attorneys. The information about venirepersons available to the attorneys varies greatly, given the court's voir dire practice. Nevertheless, in U.S. courts, the parties (prosecution, plaintiff, and defendant) have a right to a certain number of peremptory excusals. These peremptory excusals are determined and used during the jury selection process.

Traditional Attorney-Conducted Jury Selection

How do attorneys evaluate venirepersons and decide whom to favor or oppose? Lawyers are sometimes influenced by the published preferences of famous colleagues—the idols of the tribe. These famous trial lawyers have published preferences mainly based on ethnic, religious, gender, and occupational stereotypes that may often conflict with each other. These stereotypes were formed long ago and have no application to modern jurors or cases. Many attorneys hold other stereotypes that may have some limited value, for example, that nurses are unsympathetic to pain and suffering or that people who use newspaper coupons give stingy monetary awards. In addition, a trial attorney's experience with a particular type of juror may result in prejudice for or against such jurors in future trials. Attorneys also evaluate venirepersons on the basis of “vibes”—their impression of the venireperson's nonverbal behavior and deportment. Generally, the attorney has a limited profile of good and bad jurors derived from advice from other attorneys, prejudices, speculation, and experience.

Origin of Scientific Jury Selection

In the 1972 Harrisburg Seven trial of Vietnam War resisters, Jay Schulman and colleagues decided to evaluate venirepersons on the basis of a survey. Schulman surveyed 840 respondents in the trial venue, recording diverse attitudes possibly related to juror view of war resisters. Respondents indicated what they thought of various antiwar activities, which historical figures they admired, their level of trust in government and the establishment, and many demographic features such as age, sex, education, occupation, media preference, and residence. Demographic variables were then statistically correlated with attitudes suggesting support for the government and the Vietnam War. Schulman reported that respondent sex, education, religion, and media preference distinguished “good” from “bad” jurors. In principle, jurors at the trial who had features that were bad (male, better educated, Protestant, attended to local media) would be excused peremptorily. Despite the apparently scientific approach, it is clear from Schulman's article that the Harrisburg Seven jury was chosen by a mishmash of survey findings and old-fashioned practice (including informant information on certain venirepersons; speculation about how a given juror was likely to relate to other jurors; speculation on racism; and deliberation among the multiple lawyers, social scientists, and defendants about the desirability of prospective jurors).

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