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Jury selection

Jury selection is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jury selection rather than just read about it. In short: Jury selection is the selection of the people who will serve on a jury during a jury trial. The group of potential jurors (the "jury pool,” also known as the venire) is first selected from among the community using a reasonably random method.

Jury selection — main illustration
Jury selection — illustration

Key takeaways

  • Jury selection belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Jury selection to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Jury selection from memory before moving on to harder problems.

Reference excerpt

Jury selection is the selection of the people who will serve on a jury during a jury trial. The group of potential jurors (the "jury pool,” also known as the venire) is first selected from among the community using a reasonably random method. Jury lists are compiled from voter registrations and driver license or ID renewals. From those lists, summonses are mailed. A panel of jurors is then assigned to a courtroom. The prospective jurors are randomly selected to sit in the jury box. At this stage, they will be questioned in court by the judge and/or attorneys in the United States. Depending on the jurisdiction, attorneys may have an opportunity to mount a challenge for cause argument or use one of a limited number of peremptory challenges. In some jurisdictions that have capital punishment, the jury must be death-qualified to remove those who are opposed to the death penalty. Jury selection and techniques for voir dire are taught to law students in trial advocacy courses. However, attorneys sometimes use expert assistance in systematically choosing the jury via a process of scientific jury selection, although other uses of jury research are becoming more common. The jury selected is said to have been "empaneled".

Voir dire

Selected jurors are generally subjected to a system of examination whereby both the prosecution (or plaintiff, in a civil case) and defence can object to a juror. In common law countries, this is known as voir dire. Voir dire can include both general questions asked of an entire pool of prospective jurors, answered by means such as a show of hands, and questions asked of individual prospective jurors and calling for a verbal answer. In some jurisdictions, the attorneys for the parties may question the potential jurors; in other jurisdictions, the trial judge conducts the voir dire. The method and scope of the possible rejections varies between countries:

In England, these objections would have to be well based, such as the defendant knowing a potential juror, to be allowed. Some jurisdictions, including Australia, France, New Zealand, Northern Ireland, the Republic of Ireland, and the United States, give both the defense and the prosecution a specific number of unconditional peremptory challenges. No justifications have to be brought to exclude a specific juror. Generally, defense attorneys exclude jurors who have professions or backgrounds similar to that of the victim and who could thus feel an emotional link to them, while prosecuting attorneys exclude jurors who might show affinity to the defendant. However, in the United States, if either party excludes a minority group member and the other party challenges, under Batson rules the party exercising the peremptory strike must provide a race-neutral reason for the exclusion (later extended by court rulings to gender-neutral reasons as well). Parties have been known to peremptorily strike jurors based on personal characteristics that wouldn't justify a strike for cause, but which they believe makes the juror less likely to be sympathetic to their side. In some jurisdictions, attorneys also have the right to make a challenge for cause argument to the judge. This is an argument over whether a juror's particular background or beliefs make them biased and therefore unsuitable for service on the jury.

United States

In the United States the process of voir dire is often much more in-depth than in other countries and its practical implementation is somewhat controversial because of this. The amount of privacy that the potential jurors are afforded when asked questions raises the issue of the definition of "impartial jury". Some people are skeptical as to whether the intensive questioning of potential jurors looks not just for inherent bias but for a potential to be emotionally swayed. On the other hand, proponents argue that this method gives both sides more confidence in the verdict. Generally, the prosecution and the defense want the maximum amount of information about the jurors, so that they can estimate which people are most likely to be sympathetic to their case. Although the practice is opposed by the American Bar Association in their "Standards on Juror Use and Management", prosecutors, defense attorneys, and news media can in most cases legally take some of the information jurors disclose, such as their home addresses, and use it to investigate the jurors outside the court through such means as running criminal background checks or simply driving past the jurors' homes to see what information they can glean from its appearance. These independent investigations usually happen without any notice to the jurors, the court, or other parties in the case.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Jury selection

Start with the simplest possible case. Write down what Jury selection claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jury selection before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jury selection ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jury selection

In research
Jury selection appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Jury selection in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Jury selection is common in secondary-school and first-year university syllabi. It links to neighbouring topics Applications of randomness, Juries, Legal procedure, so understanding it makes those chapters shorter.
In everyday life
Look for Jury selection outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jury selection in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Jury selection means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Jury selection out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jury selection in simple terms?

Jury selection is the selection of the people who will serve on a jury during a jury trial. The group of potential jurors (the "jury pool,” also known as the venire) is first selected from among the community using a reasonably random method.

Why does Jury selection matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jury selection?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jury selection.

Tags

  • Applications of randomness
  • Juries
  • Legal procedure

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