Standard Practice for the Collection and Preservation of Organic Gunshot Residue (OGSR)

Importancia y uso:

5.1 This practice provides best practices to be followed in the collection and preservation of OGSR samples intended for forensic analysis.

5.1.1 This practice applies to the collection of OGSR from surfaces in both field and laboratory settings.

5.1.2 Adhesive tape lifting is suitable for collecting OGSR from many dry surfaces, including skin, hair, and clothing (1-4).3

5.1.2.1 Other OGSR collection techniques such as swabbing, and vacuuming have been reported but they are not recommended for routine practice.

5.2 Gunshot residue (GSR) examinations are commonly performed to determine if an individual could have been exposed to firearm discharge. Traditional GSR analysis has relied upon the detection of pGSR, as described in Practice E1588; however, OGSR provides information that complements pGSR analysis (1, 5). This standard practice is of use to forensic laboratories desiring to supplement pGSR analysis with OGSR analysis to identify surfaces exposed to gunshot residue.

5.3 OGSR originates from the combustion of the smokeless powder and the priming mixture following their ignition during the firearm discharge process. After a firearm has been discharged, the combined residue can be found on exposed surfaces in the vicinity of the fired weapon (for example, hands, other exposed skin surfaces, hair, clothing) (2, 5). OGSR can also be found in the cartridge case after firing and can be recovered to provide information about the constituents of the propellant or the priming mixture, or both.

5.4 This standard practice does not apply to the analysis or interpretation of OGSR, or pGSR.

Subcomité:

E30.13

Volúmen:

14.02

Número ICS:

07.140 (Forensic science)

Palabras clave:

collection; forensic science; OGSR; organic gunshot residue; preservation;