In all criminal prosecutions the accused hath a right to be heard by himself and his counsel, to demand the nature and cause of the accusation against him, to be confronted with the witnesses against him, to have compulsory process for obtaining witnesses in his favor, and, in prosecutions by indictment or information, a speedy public trial by an impartial jury of the vicinage; he cannot be compelled to give evidence against himself, nor can he be deprived of his life, liberty or property, unless by the judgment of his peers or the law of the land. The use of a suppressed voluntary admission or voluntary confession to impeach the credibility of a person may be permitted and shall not be construed as compelling a person to give evidence against himself.