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.
說白了就是被告有權和證人當麵對質,這也就是電影電視中經常看到的所謂的cross exam, 否則證詞無效。不知道中國是否有類似的法律規定。