In law, cross-examination is the interrogation of a witness by one's opponent. It is preceded by direct examination (known as examination-in-chief in Ireland, the United Kingdom, Australia, Canada, South Africa, India and Pakistan) and may be followed by a redirect (known as re-examination in the aforementioned countries). A redirect examination, performed by the attorney or pro se individual who performed the direct examination, clarifies the witness' testimony provided during cross-examination including any subject matter raised during cross-examination but not discussed during direct examination. Recross examination addresses the witness' testimony discussed in redirect by the opponent. Depending on the judge's discretion, opponents are allowed multiple opportunities to redirect and recross examine witnesses (this may vary by jurisdiction).
Since a witness called by the opposing party is presumed to be hostile witness, are allowed on cross-examination. A witness called by a direct examiner, on the other hand, may only be treated as hostile by that examiner after being permitted to do so by the judge, at the request of that examiner and as a result of the witness being openly antagonistic and/or prejudiced against the party that called them.Ehrhardt, Charles W. and Stephanie J. Young, "Using Leading Questions During Direct Examination" , Florida State University Law Review, 1996. Accessed November 26, 2008.
Attorneys anticipate hostile witnesses' responses during pretrial planning, and often attempt to shape the witnesses' perception of the questions to draw out information helpful to the attorney's case.Dreier, A.S.; Strategy, Planning & Litigating to Win; Conatus, Boston, MA, 2012, pp. 79-85; Typically during an attorney's closing argument, they will repeat any admissions made by witnesses that favor their case. In the United States, cross-examination is seen as a core part of the entire adversarial system of justice, in that it "is the principal means by which the believability of a witness and the truth of his testimony are tested." Davis v. Alaska, . Another key component affecting a trial outcome is jury selection, in which attorneys will attempt to include jurors from whom they feel they can get a favorable response or at the least an unbiased fair decision. So while there are many factors affecting the outcome of a trial, the cross-examination of a witness will often influence an open-minded unbiased jury searching for the certainty of facts upon which to base their decision.
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