Voir dire, meaning roughly "to speak the truth," is the process of questioning prospective jurors before trial to determine who will sit on the panel. The judge, the attorneys, or both, depending on the jurisdiction, ask questions designed to surface bias, conflicts of interest, or life experiences that might make a juror unable to be fair. Jurors can be removed in two ways: a challenge for cause, which is unlimited in number but requires the challenging party to demonstrate actual or presumed bias to the judge's satisfaction, and a peremptory challenge, which requires no stated reason but is limited in number and cannot be used to strike jurors based on race or gender under the Batson and J.E.B. line of cases.

Practice varies significantly by court. Federal judges often conduct most or all of the questioning themselves, with attorneys submitting proposed questions rather than examining the panel directly, which tends to shorten the process considerably compared to state practice. State courts frequently give attorneys much more latitude to question jurors directly, sometimes over hours or days for complex cases. In high-profile or emotionally charged matters, courts sometimes use written juror questionnaires beforehand to speed up in-person questioning, and parties may retain jury consultants to help assess how the venire is likely to respond to the case themes and witnesses.

Jury composition is exogenous uncertainty that no amount of preparation fully eliminates, and voir dire narrows that uncertainty rather than controlling it outright. Juricratic treats the jury-composition dimension of a modeled trial as a variance band that voir dire can tighten somewhat but never collapse to a known value, which keeps a simulated trial outcome honestly probabilistic instead of presenting jury behavior as something a party can fully engineer. A user exploring a trial branch should expect the model to preserve that residual spread rather than quietly resolve it away.

Trial counsel and jury consultants use voir dire to identify jurors most likely to be sympathetic or hostile to their case theory and to spend limited peremptory challenges where they will matter most. Batson challenges, alleging improper race- or gender-based strikes, are litigated live during selection and can affect the composition of the panel or even trigger appellate review after verdict.