Abstract
BackgroundThe microscopic examination of fired cartridge cases and fired bullets helps the expert to determine if a suspect firearm/firearms were, or were not, discharged in a shooting incident. This is achieved by using a combination of class and individual characteristics. But in case of malfunctioning of firearm, experts have to adopt different methods to link fired cartridge cases and fired bullets with the suspected firearm.Case presentationIn this paper, a new method for the reproduction of the firing pin and breech face impression on two different surfaces are reported. Two chosen surfaces are plasticine and lead metal.ConclusionsThe surface of the lead being soft and brittle reproduced the impression with maximum detail. Five match points were seen on the lead surface with clear demarcation whereas only three points of individual characteristics marks were observed on plasticine surface.
Highlights
The microscopic examination of fired cartridge cases and fired bullets helps the expert to determine if a suspect firearm/firearms were, or were not, discharged in a shooting incident
Impression surfaces The surfaces chosen for the reproduction of the firing pin and breech face impression were lead and plasticine
In 1938, Moritz proposed a technique utilizing cellulose acetate with an acetone or amyl-acetate vehicle for the reproduction and comparison of the individual characteristics on cartridge cases, bullets and breech faces (Morrrz, 1938; Biasotti, 1956)
Summary
The microscopic examination of fired cartridge cases and fired bullets helps the expert to determine if a suspect firearm/firearms were, or were not, discharged in a shooting incident. Case presentation A case for linking of fired cartridge with a country made pistol having a broken barrel was received in Punjab Forensic Science Laboratory, Mohali, Punjab (India). The firing pin and breech face impressions were successfully reproduced on two surfaces for comparison with fired crime cartridge case.
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