What Is Gun Residue?
Gun residue, often called firearm discharge residue (FDR), consists of microscopic particles expelled when a gun is fired. It can include burnt and unburnt propellant, primer compounds, and trace metals from the cartridge. Forensic teams collect it from hands, clothing, and surfaces to help determine whether a person recently discharged a weapon.
Role of Gun Residue in the Tory Lanez Case
In the Tory Lanez case, prosecutors presented forensic evidence including gun residue as part of the case. According to court filings and reporting, residue testing was used to support claims about weapon handling during the incident. Defense teams typically challenge such evidence by questioning collection methods, chain of custody, and potential secondary transfer of particles.
How Forensic Labs Analyze Gun Residue
Labs use techniques such as scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) to identify characteristic elements like lead, barium, and antimony in residue. Results are interpreted alongside other evidence, including witness statements, ballistic analysis, and digital records. Agencies such as the Bureau of Alcohol, Tobacco, Firearms and Explosives provide guidelines on testing and reporting procedures.
