“It is well established that cl. (3) of Art. 20 is directed against self-incrimination by an accused person. Self-incrimination must mean conveying information based upon the personal knowledge of the person giving the information and cannot include merely the mechanical process of producing documents in court which may throw a light on any of the points in controversy, but which do not contain any statement of the accused based on his personal knowledge. For example, the accused person may be in possession of a document which is in his writing or which contains his signature or his thumb impression. The production of such a document, with a view to comparison of the writing or the signature or the impression, is not the statement of an accused person, which can be said to be of the nature of a personal testimony. When an accused person is called upon by the Court or any other authority holding an investigation to give his finger impression or signature or a specimen of his handwriting, he is not giving any testimony of the nature of a 'personal testimony. ' The giving of a 'personal testimony' must depend upon his volition. He can make any kind of statement or ay refuse to make any statement. But his finger impressions or his handwriting, in spite of efforts at concealing the true nature of it by dissimulation cannot change their intrinsic character. Thus, the giving of finger impressions or of specimen writing or of signatures by an accused person, though it may amount to furnishing evidence in the larger sense, is not included within the expression 'to be a witness. '
