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    Firearms & Tool Marks

    Tim Duerr-Laboratory Supervisor
    Chris Monturo

    The Firearm and Tool Mark Section performs analyses in several areas of comparison. The examiners can identify the firearms used during a crime by micFirearm Reference Collectionroscopically comparing crime scene bullets with known test fired bullets.

    Serial numbers which have been damaged can be restored using chemicals. Thus stolen firearms can be traced to their owners.

    Investigations can be aided by analyzing for the presence of gunshot  residues for the purpose of distance determination.

    When a tool is used to pry something open, the examiner can compare the characteristic marks left at the crime Bullet Comparisonscene with those of the suspected tool. This section also maintains an open case file which contains cartridge casings from unsolved homicides and serious felonious assaults for comparison with weapons submitted by police agencies.

    Cartridge Case ComparionThe section examines approximately 1500 cases per year, including such procedures as bullet and cartridge case comparisons, serial number restorations, weapon operability, tool mark analysis, and firing distance determinations.