In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the Assistance of Counsel for his defence.

Satisfying the Confrontation Clause has been described as the act of placing a witness face-to-face with the defendant, so that the defendant may cross-examine the witness in the presence of both the judge and jury. However, what happens if the witness is unavailable to testify in court?