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Drug Testing Advisory Board Biographical Information


DTAB Members Biographies


Kristen Burke, B.S., M.B.A., CA

Kristen currently serves as the Regional Toxicology Liaison for NHTSA Region 9 and is a toxicology consultant. She formerly served as the Laboratory Director for the CA Department of Justice (CA DOJ), Bureau of Forensic Services (BFS). Prior to state employment, she worked as a Toxicologist in the private sector for 7.5 years in Portland, OR. She worked for Sacramento County Crime Laboratory in CA, as a Criminalist in the Toxicology unit and as a Supervising Criminalist/Quality Manager. Kristen has provided presentations regarding Toxicology and DUID at training seminars for law enforcement and prosecutors. She has served as a lead for one of the six sub-committees (Toxicology) to assist the CA Office of Traffic Safety (OTS) to develop a DUID Blueprint that identifies challenges and effective countermeasures for DUID in CA. Kristen served as the Chair for the Data, Technology, and Research Subcommittee of the CA Impaired Driving Task Force and oversaw the development of a state-wide oral fluid research project where the CA DOJ Toxicology Laboratory evaluated the benefits of oral fluid testing for DUID casework. Kristen has provided testimony regarding the effects of alcohol and other drugs during her employment at Sacramento County Crime Laboratory and CA Department of Justice, Bureau of Forensic Services.

Kristen earned a Bachelor of Science in Biology (Micro/Molecular) from Portland State University, her M.B.A. from the University of Southern CA, and is a candidate for a M.S. degree in Ayurveda Integrative Medicine from Maharishi International University. She is a member of the California Association of Toxicologists, the National Safety Council - Alcohol, Drugs, and Impairment Division, Society of Forensic Toxicologists where she was a previous member of the Oral Fluid Committee.

David A. Engelhart, Ph.D., D-ABFT-FD, OH

Dr. Engelhart has served as the Laboratory Director for Omega Laboratories, Inc. since 2005 and has over 26 years of experience in forensic toxicology. Omega Laboratories, Inc. is a forensic drug testing facility located in Mogadore, Ohio which focuses on the analysis of hair and oral fluid specimens for drug of abuse. His prior employment was with the Office of the Cuyahoga County Coroner located in Cleveland, Ohio where he was instrumental in the toxicology laboratory acquiring and maintaining ABFT accreditation.

David received his Bachelor of Science degree in Chemistry from Hiram College and his Doctorate Degree in Chemistry from Case Western Reserve University. He is a board-certified Diplomate of the American Board of Forensic Toxicology in Forensic Drug Toxicology and an inspector for the College of American Pathologists Forensic Drug Testing laboratory accreditation program and a member of the Society of Forensic Toxicologists.

E. Lindsey Everson, J.D., TX

Lindsey Everson is a partner with Caldwell Everson P.L.L.C. Mr. Everson has represented some of the largest forensic drug testing laboratories in the United States. He has also provided legal services to third-party administrators and medical review officers in litigation nationwide. Besides providing laboratories and third-party administrators legal services across the country, he also provides consultation and litigation services to other workplace drug testing entities, including employers and collection sites. Lindsey has consulted with both non-certified laboratories and SAMHSA-certified laboratories regarding compliance with National Laboratory Certification Program guidelines and FDT industry standards for forensic workplace drug testing. On behalf of various drug-testing industry entities, he has offered his expertise to Firm clients providing documentary and testimonial evidence in Department of Transportation enforcement proceedings. Lindsey also provides services to Firm clients in proceedings and investigations brought by federal and state agencies with regulatory oversight authority over various FDT entities. Lindsey regularly represents and provides legal advice to Firm clients regarding third-party requests for federal and state-regulated drug testing information and records.

Lindsey received his Bachelor of Arts Degree in Political Science in May 1994 at Texas A&M University and his Juris Doctorate, Cum Laude from the University of Houston Law Center in May 1997 following which he was admitted into the Bar in the U.S. District Court, Eastern, Northern and Southern Districts of Texas.

Dawn M. Hahn, M.B.A., M.T. (ASCP), D-ABFT, KS

Dawn Hahn is the Lab Operations Director and Responsible Person of the Quest Diagnostics Employer Solutions Laboratory in Lenexa, Kansas. Dawn obtained her Bachelor of Arts degree in medical technology from Northwestern College and obtained her M.B.A. from JHU. Prior to joining Quest Diagnostics, Dawn worked as a medical technologist in several clinical laboratories. She joined Home Office Reference Laboratory (HORL) in 1987 performing risk assessment testing for life insurance applicants. HORL eventually became LabOne, which then became Quest Diagnostics in 2005. LabOne obtained its SAMHSA certification in 1994. Dawn played a significant role in the lab obtaining this certification. She has worked for Quest Diagnostics for over 35 years and has held several different roles in the SAMHSA certified laboratory. In her current role, which she has held for over 9 years, she oversees one of the largest workplace drug testing labs in the nation. Quest Diagnostics performs drug testing in urine, oral fluid and hair so Dawn will bring much experience and knowledge to the board as we add alternate matrices to the Federal Program. Dawn has been a consultant for the National Laboratory Certification Program since 2005 performing inspections and serving on the oral fluid lab manual working group. Dawn is a board-certified Diplomate with the American Board of Forensic Toxicology (ABFT) and a member of the Society of Forensic Toxicologists.

Deborah Motika, M.S., D-ABFT-FT, TC (NRCC) MLS(ASCP), PA

Ms. Motika has over 40 years of experience in the Laboratory Medicine/Forensic Toxicology environment. She currently is the owner of Motika Forensic Toxicology Consulting LLC. In this role she currently works for Penn State Health, Saint Joseph Medical Center as the Review and Certifying Scientist of non-SAMHSA Workplace and Pain Management Drug Testing. She also advises the laboratory management on current needs and requirements for drug testing. She also advises other laboratories and toxicology sales teams on current requirements and regulations pertaining to Pain management/Addiction Treatment drug testing. Additionally, she is the toxicologist for the Berks County PA coroner’s office. Prior to that she worked for Drugscan, Horsham, PA in various roles first as Director of Laboratory Operations as the Senior Vice President Toxicologist prior to leaving the company at the end of 2020. She also built a full-service toxicology lab at St. Joseph Medical Center Reading PA that serviced local addiction treatment, probation and parole, coroner’s office, children’s services and clinical practices while also managing the majority of the clinical laboratory departments and also served as the Breath Alcohol trainer for the hospital. Deborah served 8 years as local President of the AACC Philadelphia section.

Deborah received a Bachelor of Science Degree in Chemistry Medical Technology from Elizabethtown College, a Master of Science Degree in Clinical Chemistry at West Chester University and a Master of Science Degree in Forensic Toxicology from the University of Florida. She is certified by the American Board of Forensic Toxicology as a Diplomat in Forensic Toxicology, by NRCC as a Toxicological Chemist and ASCP as a Medical Laboratory Scientist.

David K. Roberts, Ph.D., OR

Dr. David Roberts is the Manager and Responsible Person for Legacy Health, Legacy Laboratory Services in Portland, Oregon, a laboratory certified by the Substance Abuse and Mental Health Services Administration to perform drug testing for specimens regulated by the Federal Workplace Drug Testing Program. He also serves as the Scientific Director for the College of American Pathologist Forensic Drug testing as well as the Forensic Specimen Collections services that perform DOT regulated evidential breath alcohol testing.

David earned his Bachelor of Arts degrees in Chemistry and Biology at the University of Missouri at Kansas City and his Ph.D. in Toxicology from Texas A & M University. David is a board-certified Fellow with the American Board of Forensic Toxicology (ABFT) and a member of the Society of Forensic Toxicologists. He also holds a certificate as a Toxicological Chemist from the National Registry of Certified Chemists.

Bryan Ruggery, MFS, D-ABFT-FT, VA

Mr. Ruggery presently serves as a Drug Science Specialist with the Drug and Chemical Evaluation Section in the Diversion Control Division of the Drug Enforcement Administration. His responsibilities include providing leadership on technical and scientific matters associated with drugs and toxicology while assisting with drug control scheduling actions, processing exemption applications, evaluating control status inquiries, and analyzing data from the National Forensic Laboratory Information System (NFLIS). He also participates in scientific conferences and inter- and intra- agency meetings concerning drug issues and chemical control. Bryan earned a Bachelor of Science in Applied Forensic Sciences from Mercyhurst College in 2007 and a Master of Forensic Science in Forensic Toxicology from The George Washington University in 2009. He has formerly held several relevant positions. He served as a Medical Technologist at Quest Diagnostics Nichols Institute in Chantilly, VA. He also served as a Forensic Toxicologist with the Office of the Chief Medical Examiner (OCME) in Washington, DC., where he conducted toxicological and drug analysis on Medicolegal Death Investigation, Driving Under the Influence, and Drug Facilitated Crime related casework.

Bryan earned board-certification as a Diplomate with the American Board of Forensic Toxicology (ABFT) and is a full member of the Society of Forensic Toxicologists (SOFT) and an associate member in the Toxicology Section of the American Academy of Forensic Sciences (AAFS).

Alison Stockdale, VA

Alison Stockdale is the Branch Chief/Drug Program Manager with the Department of the Interior, ensuring proper execution of the Department’s Drug-Free Workplace Program. Additionally, as part of the Interior Business Center, her office provides support services to 70 other federal agencies assisting in the execution of their Drug-Free Workplace programs. Her staff assist customers with random testing selection, scheduling, testing, applicant notification, training and on-site collection services. Ms. Stockdale is the Contracting Officer’s Representative for two contracts which are responsible for 50,000 drug tests annually. She is a trained collector and has performed thousands or urine collections. She is a subject matter expert in Federal Workplace Drug Testing policy.

Alison received her Bachelor Degree in Government from Sweet Briar College and a Master Certificate in Business Skills from George Washington University School of Business.

Elizabeth “Libby” B. Stuyt, M.D., CO

Dr. Stuyt is a board-certified Addiction Psychiatrist who has worked in the addiction/behavioral health field since 1990 and was the Medical Director for the Circle Program, a 90-day inpatient treatment program. She works currently as a consultant for Solvista Behavioral Health in Salida, Colorado and educates people nationally on the effects of high potency THC on the developing brain. She is recognized as an expert in interpreting drug test results. Her knowledge of addiction psychiatry and THC is a beneficial addition to DTAB.

Libby earned her Bachelor of Science degree in Biomedicine and a Master of Science degree in Biochemistry from Texas A&M University, and her Doctor of Medicine degree from Texas Tech University.

Dr. Stephen Mark Taylor, M.D., M.P.H., D.F.A.P.A., D.F.A.S.A.M, AL/GA

Dr. Stephen Taylor is board-certified in general psychiatry, child and adolescent psychiatry, addiction psychiatry, and addiction medicine. In his nearly 30 years of practice experience, and as an educator and presenter, Dr. Taylor’s life’s work and greatest passion has been to help teenagers and adults avoid or overcome the devastating disease of addiction and co-occurring general psychiatric disorders.

Dr. Taylor serves as the Chief Medical Officer of Pathway Healthcare, where he is an integral part of Pathway’s work of opening and operating outpatient addiction treatment offices in Texas, Louisiana, Mississippi, Tennessee, Alabama and Arkansas. Dr. Taylor is a certified Medical Review Officer (MRO) and has served on the Board of Directors of the Medical Review Officer Certification Council (MROCC) for over 10 years. For the past 16 years, Dr. Taylor has served as the Medical Director of the Player Assistance/Anti-Drug Program for the National Basketball Association (NBA) and National Basketball Players Association (NBPA). One of his many responsibilities in that role has been to serve as the MRO for all of the players of the NBA. Dr. Taylor earned a Bachelor of Arts Degree in History and Science from Harvard College, a Master of Public Health Degree from the Harvard School of Public Health and a Doctor of Medicine Degree from Howard University College of Medicine. Dr. Taylor is a Distinguished Fellow of the American Psychiatric Association (APA) and a Distinguished Fellow of the American Society of Addiction Medicine (ASAM). As of the end of April 2023, Dr. Taylor will begin his term as the President-Elect of ASAM.

Last Updated

Last Updated: 04/24/2023

Last Updated