BALLISTIC “FINGERPRINTING”
Myth: Every firearm leaves a unique "fingerprint"
that can pinpoint the firearm used
Fact: A group of National Research Council scientists concluded that this has not yet
been fully demonstrated. Their research suggests that the current technology for
collecting and comparing images may not reliably distinguish very fine differences.101
Fact: "Firearms that generate markings on cartridge casings can change with use and can
also be readily altered by the users. They are not permanently defined like fingerprints or
DNA."102
Fact: "Automated computer matching systems do not provide conclusive results.”103
Fact: “Because bullets are severely damaged on impact, they can only be examined
manually”.104
Fact: “Not all firearms generate markings on cartridge casings that can be identified
back to the firearm.”105
Fact: The same gun will produce different markings on bullets and casings, and different
guns can produce similar markings.106 Additionally, the type of ammunition actually
used in a crime could differ from the type used when the gun was originally test-fired -- a
difference that could lead to significant error in suggesting possible matches.107
Fact: The rifle used in the Martin Luther King assassination was test fired 18 times
under court supervision, and the results showed that no two bullets were marked alike.108
“Every test bullet was different because it was going over plating created by the previous
bullet.”
Fact: "The common layman seems to believe that two bullets fired from the same
weapon are identical, down to the very last striation placed on them by the weapon. The
trained firearms examiner knows how far that is from reality."109
101 Ballistic Imaging, Daniel Cork, John Rolph, Eugene Meieran, Carol Petrie, National Research Council,
2008.
102 Feasibility of a Ballistics Imaging Database for All New Handgun Sales, Frederic Tulleners, California
Department of Justice, Bureau of Forensic Services, October, 2001 (henceforth FBID).
103 Ibid.
104 Ibid.
105 Ibid.
106 Handbook of Firearms & Ballistics: Examining and Interpreting Forensic Evidence, Heard, 1997.
107 Ballistic Imaging, Daniel Cork, John Rolph, Eugene Meieran, Carol Petrie, National Research Council,
2008.
108 Ballistics 'fingerprinting' not foolproof, Baltimore Sun, October 15, 2002.
109 AFTE Journal , George G. Krivosta, Winter 2006 edition, Suffolk County Crime Laboratory,
Hauppauge, New York.