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A History of Expertise and Innovation

RJ Lee Group has assessed environmental issues since the early 1980s when our Energy Technology Consultants (ETC) pioneered the recognition of specific air quality patterns. We developed a cutting-edge technique for identifying, measuring, and characterizing particles in the air using computer-controlled scanning electron microscopy (CCSEM).

RJ Lee Group has worked with clients in various industries, including the U.S. Environmental Protection Agency (EPA), to assess and provide solutions for environmental factors that could affect our health. Our services have grown over the years, from setting controls for unbound nanoparticles (UNP) to designing and building test chambers to simulate specific environmental conditions.

Today we offer our expertise for our clients’ environmental and compliance concerns and perform rigorous assessment and management of potential environmental risks.


Criminal Forensics

When it comes to selecting a forensics laboratory to support your case, trust is critical. RJ Lee Group has an exceptional track record for collaborating with a broad range of law enforcement and legal agencies to assist in cases pertaining to primer gunshot residue and distance determination. Our accreditation by the American Association for Laboratory Accreditation (A2LA) is a testament to the quality of our work. 

Our team of dedicated experts brings their extensive knowledge to criminal cases, ensuring accurate resolutions for our clients. With a broad clientele of law enforcement agencies and prosecutorial and defense attorneys’ offices, we provide an unwavering commitment to impartiality.

Our team frequently collaborates with over 400 agencies not only within the United States but also across the Caribbean and as far as New Zealand. We form close partnerships with law enforcement agencies, public defenders, private defense attorneys, prosecutors, private investigators, and other forensic laboratories by actively supporting investigations and providing reliable and impartial forensic analysis.

GSR Test

Primer Gunshot Residue (GSR) Analysis

We pride ourselves on our positive reputation in the industry, offering:

  • A2LA-accredited in GSR Analysis
  • Expertise in diverse surface GSR sampling
  • Efficient GSR testing with exceptional turnaround times
  • Pioneered the use of computer-controlled scanning electron microscopy
  • Qualified as expert witnesses in 36 states, as well as Washington DC, Puerto Rico, and six additional countries

RJ Lee Group streamlines GSR collection and testing with our all-in-one GSR Test Kits, available free of charge when testing 

Muzzle-to-Target Distance Determination

When provided the garment a bullet passed through and the firearm and ammunition from an incident, RJ Lee Group’s experts can conduct a distance determination analysis.

  • Exclusive private laboratory with A2LA accreditation for distance determination
  • Efficient turnaround times
  • Qualified as expert witnesses throughout the United States

Criminal Forensic Consultations

Our experts abilities go beyond analysis, we also offer consulting in the areas of primer GSR and distance determination
  • Review and critique laboratory reports from other laboratories
  • Develop the best strategy for our clients’ cases.
  • Help prepare our clients for testimony questioning.

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.

Case study

Case study

How AeroTech Secured Its Future

When AeroTech Industries faced recurring defects in a crucial aircraft component, they were at risk of losing multi-million dollar contracts and jeopardizing the jobs of hundreds of employees. They enlisted the help of RJ Lee Group, who quickly deployed a team of technical experts. Through state-of-the-art forensic analysis, RJ Lee Group identified and rectified the root cause—a flaw in the casting process—eliminating the defect and preserving AeroTech's contracts.

Get the Criminal Forensics Expertise You Need with RJ Lee Group

Utilize our scientific expertise to crack a difficult case, identify evidence, and support your forensic investigation. Schedule a time to chat with our experts about how we can help you.