Gunshot acoustics hold plenty of investigative promise, but analysis can be difficult even for experts.
Here is a behind the scenes look at the science surrounding GSR investigations and the facts that make them dynamic.
Using integrated SEM-EDX technology to provide automatic, rapid, and validated results.
3D scans of cartridge casings and expended bullets offer significant correlation and accuracy advantages. While responsible for solving thousands of firearms crimes in the past, 2D forensic ballistics systems are clearly behind the technology curve.
New generation SEMs incorporate computer automation and detector technology that allows for rapid elemental analyses of small particles. Already the gold standard for GSR analysis, the technique is being evaluated for forensic soil comparisons.
ISO 17025 requires laboratories to document how uncertainty was calculated. Find out ways to become more comfortable with your uncertainty calculations.
In a 2007 shooting, primer residue was found on the prime suspect. In his defense he claimed that the residue came not from firing a gun, but from using a Hilti nail gun, a powder-actuated tool, at his construction job. This study addresses the fallacy of the “Hilti Defense.”
Scanning electron microscopes (SEM) provide forensic investigators with critical imaging and analytical capabilities that are not available from other techniques. In particular, they can resolve features as small as a nanometer, allowing useful magnifications of 100,000 times or more.
Lawyers, judges, and juries can be seriously misled by crime laboratory findings of the presence of gunshot residues (GSR).