licht, a forensic document examiner. he compared the note to known samples of helble's handwriting. >> the question material was written with somewhat heavy pressure. in the known writings, that was written with the same pressure. it was hand printed. and his known writings relied heavily on printing and not cursive. >> he looked for unique features in individual letters in john's known writings, features he then tried to locate in the questioned document. based on his comparisons, licht was able to draw a definitive conclusion. >> i was able to identify the writer of the question material as john helble. >> proof that it was helble's gun, and no other, that andy took with him to texas. based on the handwriting