Starting pistols discharge residue

Discharge residue particles from starter pistol blanks were examined for comparison with discharge residue particles originating from firearms ammunition. Table 19.1 gives the starting pistol discharge residue particles classified according to their consistency with FDR particles. 

Individually, the starting pistol discharge residue particles could not be distinguished from FDR particles, by physical appearance, by size range, or by elemental composition, which includes the additional accompanying elements. ft is a reasonable assumption that discharge residue particles from... 

When the particles were considered as a group three distinct differences between firearm and starting pistol discharge residue particles were noted. 

The ratio of indicative to unique particles is markedly different from that of firearm discharge. From firearm residue casework statistics, based on cases with at least one particle in the unique category, the ratio of indicative to unique particles is approximately 35 1. For starting pistol discharge residue particles the overall ratio is in the region of 1 10. 

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