to prove their suspicions, police turned to forensic science. first seda was fingerprinted. his prints were then compared with the print left on the letter in central park. it was a match. next, handwriting experts compared the handwriting from the zodiac s letters to seda s known handwriting sample. the experts concluded they were written by the same hand. ballistics experts examined seda s collection of 15 zip guns. in his letters, zodiac claimed no one would catch him because his gun barrel didn t have the traditional lands and grooves inside for testing. but the zodiac apparently didn t know about forensic tool mark analysis. a tool mark is a characteristic left behind during the process of using a
to prove their suspicions, police turned to forensic science. first seda was fingerprinted. his prints were then compared with the print left on the letter in central park. it was a match. next, handwriting experts compared the handwriting from the zodiac s letter to seda s known handwriting sample. the experts concluded they were written by the same hand. ballistics experts examined seda s collection of 15 zip guns. his letters, zodiac claimed no one would catch him because his gun barrel didn t have the traditional lands and grooves inside for testing. but the zodiac apparently didn t know about forensic tool mark analysis.