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Criminal Forensics

Criminal justice demands scientific expertise that can deliver swift, reliable answers. That’s why RJ Lee Group specializes in achieving exceptional turnaround times for GSR analysis, including the efficient processing of backlogs. We even engage in evaluation and constructive critique of reports and data generated by other laboratories because we have a proven track record of providing criminal forensics services that consistently surpass both regulatory requirements and client expectations.

RJ Lee Group is recognized as a leading authority in the field of criminal forensics across 36 jurisdictions in the United States, as well as the Caribbean and even as far as New Zealand. Our extensive network allows us to collaborate seamlessly with over 400 law enforcement agencies. We foster strong partnerships with public defenders, private defense attorneys, private investigators, and other forensic laboratories, actively supporting investigations and delivering dependable and unbiased forensic data.

Additional Services

Gunshot Residue Analysis (GSR)

Ensure accuracy and credibility of your results with our accreditation from A2LA for both primer GSR analysis and gunshot distance determination.

Forensic Applications of Microscopy

Get faster and more accurate results from RJ Lee Group, we pioneered the application of computer-controlled scanning electron microscopy (CCSEM) in the identification of GSR particles.

Distance Determination

We utilize advanced methodologies to precisely determine the distance from which a gunshot was fired, providing invaluable insights for investigators and legal professionals.

Consulting Services

Our dedicated team of experts is available to offer their expertise to review and interpret evidence, testify as expert witnesses in court, and provide guidance on the application of forensic science principles to criminal cases.


expert spotlight

Tarah Helsel

Manager & Forensic Scientist

Tarah oversees and participates in the preparation, analysis, interpretation and reporting of gunshot residue (GSR) evidence using Scanning Electron Microscopy / Energy Dispersive Spectroscopy (SEM/EDS) techniques. She is an expert witness and has given testimony in federal and state courts, for both the prosecution and the defense on more than 90 occasions. She has been qualified as an expert witness in courts in 20 U.S. states, Puerto Rico, and the countries of Bermuda and Turks and Caicos.

Discuss Criminal Forensics Services with RJ Lee Group

Learn more about what RJ Lee Group’s criminal forensics experts can do for your investigation. Schedule a call with us today to discover how we can help you.