Oscar Vallecillo - Firing Pin Matching - 10503829.pdf -...

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FIRING PIN MATCH ACTIVITY Scenario: Three suspects were apprehended and accused of robbery. Empty shell casings were found at two different crime scenes during the past month. They are labeled A through L. Police test-fired firearms belonging to the suspects and compared firing pin impression marks made by those found on crime-scene casings. Procedure: 1. View each shell casing (enlarge) to determine each of the following: the caliber, headstamp, location of firing pin strike (center or rim), and description of firing pin marks. Record your data on Data Table 1. 2. Using the three cartridge casings from the three suspects and your information from Data Table 1, determine if any of the crime-scene casings match casings from the suspects. 3. Complete the Final Analysis below. Data Table 1: Comparison of Casings Suspect 1 Suspect 2 Suspect 3 Caliber 40 40 40 Headstamp marking Federal Federal Federal Firing pin strike (center or rim) Bottom rim Center Bottom rim Description of mark Scratch from rim

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