About Us
Elevate your Expertise
Training and resources on drug impairment are often scattered, costly, or out of reach for those who need it most. Our mission is to connect practitioners from all disciplines with credible resources from top experts in a single, easily accessible platform.
We believe the key to success in this mission resides in three principles:
Industry-Leading Instructors
DrugImpairment.com is where experts in drug recognition, forensic & clinical toxicology, medicine, vision science, and other fields come together to offer training on the complex topic of drug impairment. Our multi-disciplinary approach and inclusion of instructors with real-world experience is unmatched. Read more.
On-Demand Accessibility
Opportunities for industry-leading training are rarely next door. Access is then limited by travel time, dependence on class / conference schedules, and often exorbitant travel costs. We deliver the training you need in asynchronous e-learning courses that can be taken when and where convenient for you.
Cost Effectiveness
Classic continuing education models include paying hundreds of dollars for webinars and thousands of dollars for conferences to access cutting edge content. We use a membership-based platform to scale content over time for otherwise impossibly low fees: allowing broader access to frontline practitioners.
Meet Some of Our Instructors
Marilyn Huestis, AB, MS, PhD
Professor Dr. Dr. (h.c.) Marilyn A. Huestis retired as a tenured senior investigator and Chief, Chemistry
Joseph O. Jones, PhD
Dr. Jones has dedicated his career to forensic science since 2006, currently serving as System Director
Karl Citek, OD, PhD, FAAO
Dr. Citek is a Professor of Optometry at Pacific University College of Optometry in Forest Grove,
Chris Heartsill, BS, D-ABFT-FT
Chris Heartsill is currently certified by the American Board of Forensic Toxicology as a Diplomate –
Sabra Jones, PhD, D-ABFT-FT
Sabra Jones is a board-certified Forensic Toxicologist with a focus on transportation safety. Sabra is the
David Zimmerman
David Zimmerman received his Master of Science degree in Chemistry from the California State University of
Amy Berning, MA, ABD Psychology
Amy was a Research Psychologist with the National Highway Traffic Safety Administration’s Office of Behavioral Safety
Jennifer Renee Knudsen, Esq.
Jennifer Knudsen has been Colorado’s Traffic Safety Resource Prosecutor (TSRP) for the Colorado District Attorneys’ Council
Nelly Mikhaltsevich
Nelly Mikhaltsevich is currently a Forensic Scientist III at the Toxicology Section of the Ventura County
Amanda L.A. Mohr, MSFS, D-ABFT-FT
Ms. Amanda (Mandi) LA Mohr serves as an Associate Director at the CFSRE working in the
Marc A. LeBeau, PhD, F-ABFT
Marc A. LeBeau, PhD, is a Senior Forensic Scientist of the Scientific Analysis Section at the
Michelle Peace, PhD
Dr. Peace is a forensic toxicologist and a Full Professor in the FEPAC-accredited Department of Forensic
Jennifer Harmon, BS, MPA
Jennifer is a private forensic toxicology and forensic laboratory consultant, expert witness, quality assurance assessor with
Carrie Kirkton, MSFS, D-ABFT-FA
Carrie Kirkton is a Supervisor of Forensic Services in the Toxicology Section of the New York
Darcy Richardson, MS
Darcy Richardson, MS, is a toxicologist and the owner of Vermont Forensic Services, an independent firm
Jennifer F. Limoges, MS
Jennifer Limoges, MS, is the Associate Director/Toxicology at the New York State Police Forensic Investigation Center.
Aaron Botts
Aaron Botts has been a dedicated member of the law enforcement community since July 2008. Beginning
Curt E. Harper, PhD, F-ABFT
Dr. Curt E. Harper has over 16 years of experience as a Forensic Toxicologist. He was
Ari Briskman
Ari Briskman is a career law enforcement officer, having served in various capacities in northern Illinois
Karen Scott, PhD, F-ABFT
Dr. Karen Scott is the Director of the Forensic Toxicology Laboratory and an Associate Professor of
Dave Kopenhaver
Dave Kopenhaver, native of Williamsport, Pennsylvania has served communities for the past thirty-one years retiring in
Stephanie Watson
Stephanie Watson is an experienced prosecutor specializing in the prosecution of complex impaired driving cases. She
Taylor J. Samek
Sgt. Samek is a ten-year veteran to law enforcement and is currently assigned as a night shift supervisor at the York
Christopher Tilson, F-ABFT
Chris Tilson studied biochemistry at the Georgia Institute of Technology in Atlanta, Georgia where he received
Danielle Mata, D-ABFT-FT
Dani C. Mata, MSFS, is currently the Toxicology Technical Leader at the Houston Forensic Science Center.
Erin L. Karschner, PhD, F-ABFT
Dr. Erin L. Karschner received her Ph.D. in Toxicology with a concentration in Forensic and Analytical
Christine Moore, PhD, DSc, DABCC, FAACC
Christine Moore is the former Chief Toxicologist in the Rapid Diagnostics Division of Abbott. There, she
Jessica Lynn Ayala, PhD, D-ABFT-FT
Dr. Jessica Lynn Ayala is currently a Toxicology Supervisor at the Houston Forensic Science Center. Dr.
Dayne Laskey, PharmD, DABAT
Dr. Laskey is an associate professor at the University of Saint Joseph in West Hartford, CT.
Kristen Burke, MBA
Kristen retired from public service in 2022 and worked in the Toxicology field for over 24
Donna Papsun, MS, D-ABFT-FT
Donna Papsun is a forensic toxicologist at NMS Labs in Willow Grove, PA. She has dual
Jeff Walterscheid, PhD, F-ABFT
Dr. Walterscheid received his Bachelor of Science degree in Chemistry from the University of Texas at
Helen Chang, MS
Helen Chang is currently a Forensic Scientist III for the Toxicology Section of the Orange County
Richard Chen, MD
Dr. Richard Chen is a Clinical Assistant Professor at the Sidney Kimmel Medical College and is
Dr. Zebulon (Zeb) Graham
Lieutenant Zebulon (Zeb) Graham is a full-time law enforcement officer for one of the four largest
Christine Frenette, MS
Christine Frenette worked for 14 years as an Alcohol and Drug Toxicologist for the Royal Canadian Mounted Police (RCMP) in Canada. She is
Ahmed Mostafa, MBBCh
Dr. Mostafa is a board certified emergency physician currently practicing in the state of New York.
Sharon Kelley, MS, PhD
Dr. Sharon Kelley is the CEO for the Kelley Consulting Group, Associates for Global Narcotics Training
Gerald (Wook) Beltran, DO, MPH, MSIS, MSCJA, FAEMS, FACEP
Gerald Beltran, DO, MPH is an Emergency Physician in Greenville, SC. He is the Chief of
Donald Marose
Don Marose is President and CEO of CD Training Consultants, Inc. CD Training Consultants’ goal is to
Kregg Ochitwa, BScPT, CWCE, CredMDT
Kregg has been a registered physical therapist since 1995. Over the years his caseload has shifted
Jolene Bierly, M.S.F.S., D-ABFT-FT
Jolene Bierly is a Forensic Toxicologist with NMS Labs in Horsham, PA. As a private independent
Makayla J. Chipka, M.S.
Makayla J. Chipka, M.S. is an analytical chemist, laboratory consultant, and regulatory expert with extensive experience
David W. Bryson
David’s main responsibility at NHTSA was the development and revision of formal Emergency Medical Services clinician
Melissa D. Ostergaard, MPH
Melissa Ostergaard is a public health professional and consultant with expertise in traffic safety and injury
Steve Scarborough, B.S., CLPE
Steve Scarborough, B.S., CLPE, is a forensic scientist (retired) with 29 years with the Las Vegas
Nate Grimm, MS-LEPSL
Nate Grimm believes we should leave things better than we found them, whether it’s a campsite,
Amy Patton, PhD
Dr. Amy L. Patton is the Laboratory Director of the North Louisiana Criminalistics Laboratory, where she
David M. Lehmann, Ph.D.
Dr. David M. Lehmann is an accomplished toxicologist with nearly 20 years of cross-sector experience across
Meet Our Drug Resource Advisory Board
One of DrugImpairment.com’s most popular features is our Drug Resource Guides. Compiling the vast amount of information required for these guides, and ensuring it meets the highest degree of quality assurance, requires a team of dedicated, highly-skilled experts. We want to thank the members of our Drug Resource Advisory Board that help make this possible!
Sabra Jones, PhD, D-ABFT-FT
Sabra Jones is a board-certified Forensic Toxicologist with a focus on transportation safety. Sabra is the Regional Toxicology Liaison for the National Highway Traffic Safety Administration’s Region 5, serving Illinois,
Michael Fagiola, PhD
Dr. Michael Fagiola is board-certified forensic toxicologist and currently serves as the Deputy Chief Toxicologist for the State of Maryland Office of the Chief Medical Examiner. His responsibilities in this
Matthew P. Juhascik
Dr. Matthew P. Juhascik is the Chief Forensic Toxicologist for the Montgomery County Coroner’s Office and Miami Valley Regional Crime Laboratory in Dayton, OH. The laboratory covers over 40 counties
Celena Shrum, MS
Celena Shrum, MS, is the Toxicology Lead for the Idaho State Police Forensic Services in Pocatello, Idaho, where she has been a dedicated member of the team since 2011. In
Benjamin Gerson, MD
A graduate of the Jefferson Medical College, Dr. Gerson did residency and fellowship training at Johns Hopkins University School of Medicine. His academic career started on the faculty of the
Anisha Paul, MSFS, D-ABFT-FT
Anisha Paul works in the Toxicology division of the Vermont Forensic Laboratory. Ms. Paul holds a Master’s of Science in Forensic Science degree from Arcadia University and a Bachelor’s of
Jennifer Harmon, BS, MPA
Jennifer is a private forensic toxicology and forensic laboratory consultant, expert witness, quality assurance assessor with both ANAB and A2LA, and the Curriculum Manager for DrugImpairment.com. She currently works as a
Matthew Myers, MS, MPA
Matt draws upon a unique combination of scientific education and field law enforcement experience to provide informative education on drug impairment. His perspectives integrate practical experience from hands-on evaluation of
The Founding of DrugImpairment.com
DrugImpairment.com was founded by Matt Myers, a career law enforcement officer who fought through repeated obstacles to get training on drug impairment. As a young officer, Matt frequently dealt with drivers on drug cases and recognized the need for training beyond basic field sobriety testing. Unfortunately, his agency repeatedly declined to approve Drug Recognition Expert (DRE) training, citing a lack of need for advanced education in this area. Undeterred, Matt eventually completed DRE training and field certification on vacation leave. After initial DRE training, Matt was frustrated with the limited opportunities to continue education in that path. Further complicating matters, the high-quality training that did exist exceeded budgetary limitations of his agency – even after gaining more supportive management. Matt worked extra jobs to fund his attendance to the Borkenstein courses, several other trainings / conferences, and eventual completion of a master’s degree in Clinical Toxicology. Having experienced the challenges of continued education in this space, he resolved to make training on drug impairment more accessible to everyone who needs it.