residue particles. include any chemicals or testing materials from screening tests into the GSR Kit. DO NOT The completed GSR Kit information sheet should be included in the packaging before sealing. Results Terminology Characteristic - Particles with elemental compositions rarely found from any other source. Normally, these particles consist of lead, antimony, and barium. However, older calcium silicide based primers may have other elemental components. Consistent - Particles that are found in primer residue but can also originate from a number of relatively common, non-firearm sources. Normally, these particles consist of combinations of 2 of the 3 elements found in characteristic particles. However, other elements that are also found in primers may be considered when analyzing particles. Commonly Associated - Particles with elemental compositions that are commonly found in environmental particles from numerous sources, but may add significance to analysis when found in the presence of characteristic or consistent particles. Significance Presence of Particles - Primer residue can be deposited on the hands by firing a weapon, handling a weapon, being in the proximity of the discharge of a weapon or coming into contact with an object that has primer residue on it. The examination itself cannot determine which listed event occurred. Few Particles - Less than four characteristic particles without supporting consistent particles have limited evidentiary value. Low levels, especially single particles, have on occasion been found in the environment and on police officers who have recently handled or fired a gun. Absence of Particles - The absence of primer residue on the hands is consistent with an individual not having fired a weapon. However, it is not proof that the subject did not fire a weapon. The absence of primer residue could also occur from circumstances such as washing the hands, wiping the hands, wearing gloves, sweating profusely, environmental factors including wind and rain, bloody hands, excessive debris on the sample, normal physical activity within 4 to 6 hours passing between firing and sampling, or the weapon not producing primer residue on the hands when discharged. Hair Analysis Overview of Services Compare hair collected as evidence to known samples from the victim or suspect. Screen for viability for nuclear DNA analysis. Age, gender, and the physical appearance of the source individual be determined cannot by hair analysis.
residue particles. DO NOT include any chemicals or testing materials from screening tests into the GSR Kit. The completed GSR Kit information sheet should be included in the packaging before sealing. Results Terminology Characteristic - Particles with elemental compositions rarely found from any other source. Normally, these particles consist of lead, antimony, and barium. However, older calcium silicide based primers may have other elemental components. Consistent - Particles that are found in primer residue but can also originate from a number of relatively common, non-firearm sources. Normally, these particles consist of combinations of 2 of the 3 elements found in characteristic particles. However, other elements that are also found in primers may be considered when analyzing particles. Commonly Associated - Particles with elemental compositions that are commonly found in environmental particles from numerous sources, but may add significance to analysis when found in the presence of characteristic or consistent particles. Significance Presence of Particles - Primer residue can be deposited on the hands by firing a weapon, handling a weapon, being in the proximity of the discharge of a weapon or coming into contact with an object that has primer residue on it. The examination itself cannot determine which listed event occurred. Few Particles - Less than four characteristic particles without supporting consistent particles have limited evidentiary value. Low levels, especially single particles, have on occasion been found in the environment and on police officers who have recently handled or fired a gun. Absence of Particles - The absence of primer residue on the hands is consistent with an individual not having fired a weapon. However, it is not proof that the subject did not fire a weapon. The absence of primer residue could also occur from circumstances such as washing the hands, wiping the hands, wearing gloves, sweating profusely, environmental factors including wind and rain, bloody hands, excessive debris on the sample, normal physical activity within 4 to 6 hours passing between firing and sampling, or the weapon not producing primer residue on the hands when discharged. Hair Analysis Overview of Services Compare hair collected as evidence to known samples from the victim or suspect. Screen for viability for nuclear DNA analysis. Age, gender, and the physical appearance of the source individual cannot be determined by hair analysis.