David M. Lehmann, Ph.D.
Criminal Justice and Security Consultant
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Professional Summary
Roy G. Taylor, Ph.D. is a criminal justice and security consulting expert specializing in police procedures and law enforcement training. With a career spanning federal, state, and local law enforcement leadership roles, he brings a comprehensive perspective to analyzing law enforcement practices and procedures. His work centers on investigating use of force incidents, assessing police pursuit tactics, and evaluating the implementation of law enforcement policies.
Mr. Taylor has been retained in numerous expert witness and consulting engagements across the United States, involving police practices, law enforcement training, and security management. His Ph.D. in Criminal Justice from Walden University, along with certifications such as Certified Homeland Security Specialist III and Advanced Force Science Specialist, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving use of force and police procedures.
Work Experience
David M. Lehmann, Ph.D., is a Senior Toxicologist at Intertox, Inc. in Raleigh, NC, since 2025. He has held positions as a Senior Toxicologist; Risk Assessor and Principal Investigator, Laboratory Research at the U.S. Environmental Protection Agency, and has over 24 years of experience in the field.
Expert Intelligence
Best Descriptor
David M. Lehmann is a toxicologist specializing in environmental pollutants and human health risk assessments for medical devices.
Best Use Cases
- 1toxicological evaluations in litigation
- 2risk assessments for environmental pollutants
- 3expert testimony on medical device safety
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View full reportEducation
Ph.D. in Laboratory of Dr. Harold Smith
University of Rochester School of Medicine and Dentistry · 2005
M.S. in Laboratory of Dr. Harold Smith
University of Rochester School of Medicine and Dentistry · 2003
B.S. in Biological Science
Colorado State University · 2000
Ph.D. in Criminal Justice
Walden University · 2020
Master of Philosophy in Criminal Justice
Walden University · 2020
Command and General Staff College
US Army · 2014
Master of Science in Occupational Safety
East Carolina University · 2003
Bachelor of Science in Criminal Justice
Mount Olive College · 1997
Licenses
- Certified Firearms & Use of Force Instructor
- Law Enforcement General Instructor
- Certified Police K-9 Trainer & Handler
- Security & Threat Assessment Specialist