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General Specialty

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Marijuana Expert Witnesses

Marijuana expert witnesses and consultants listed here may be able to form expert opinions, draft expert witness reports, provide expert witness testimony at deposition and/or trial as or serve as consulting (non-testifying) experts on marijuana. The marijuana expert witness listings on this page are typically from fields/areas of expertise such as: Addiction Medicine, Cannabis, Emergency Medical Toxicology, Emergency Medicine, Forensic Science, Laboratories & Testing, Law Enf & Criminal Justice, Neurology, Occupational Medicine, Pharmacology, Pharmacology- Clinical, Psychiatry, Substance Abuse, and Toxicology.

James M. Miller, PE, PhD

Mechanical-Human Factors
Accidents-Chemical Safety
Warning-Labeling-HazCom

Ted Menadier, MBA

Expert Witness
The Business and Cultivation
of Marijuana and Hemp

Nina M. French

Workplace Drug Testing
Cannabis Expert
Alcohol and Impairment Expert

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Shaun D Carstairs, MD DFACMT FACEP

Experienced emergency physician and toxicologist

San Diego, California

Emergency Medicine, Toxicology - toxicology, poisoning, overdose, drug abuse, drug withdrawal, alcohol, urine drug screen, marijuana, fentanyl, opioids, addiction, methamphetamine, medication errors, heart attack, stroke, trauma, myocardial infarction, pulmonary embolism, snake bites, sepsis

- Triple board-certified in emergency medicine, medical toxicology, and addiction medicine, actively practicing in all 3 specialties - Distinguished Fellow of the American College of Medical Toxicology (DFACMT) and Fellow of the American College of Emergency Physicians (FACEP) - Bachelor of Science (BS) with honor from the California Institute Of Technology - Medical degree (MD) from the Uniformed Services University, the nation’s military medical school - Retired US Navy Captain with over 25 years of active duty service - Prior chief medical officer for the US Marine Corps’ 1st Marine Division - Prior residency program director and core faculty for a large emergency medicine residency program - Professor of Military & Emergency Medicine at the Uniformed Services University - More than 50 peer-reviewed publications, textbook chapters, and national/international presentations in the fields of medical toxicology and emergency medicine - Lecturer for the American College of Medical Tox...

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Michael J Kosnett, MD, MPH, DFACMT

Medical Toxicology and Occupational/Environmental

California

Toxicology, Occupational Medicine - Lead poisoning, cannabis, drug testing, alcohol, marijuana, environmental toxicology, occupational toxicology, arsenic poisoning, forensic toxicology, DUI, risk assessment, aviation toxicology, medical monitoring, risk communication, heavy metals, environmental health, public health, carbon monoxide, occupational cancer, fire toxicology

2016 Recipient of the American College of Medical Toxicology Matthew J. Ellenhorn Award [career achievement award in recognition of “extraordinary contributions to the field of medical toxicology”] Diplomate, American Boards of Internal Medicine, Preventive Medicine (Occupational Medicine), and Medical Toxicology Distinguished Fellow of the American College of Medical Toxicology (DFACMT) Active Medical Licensure in Colorado and California Professional activities have included: • Past President, American College of Medical Toxicology • Committee on Toxicology of the National Academy of Sciences • NIOSH Board of Scientific Counselors • CDC Advisory Committee on Childhood Lead Poisoning Prevention • EPA Science Advisory Board panels (lead in air, water, dust) • ATSDR expert panels (lead biomonitoring, hair analysis) • WHO consultant and temporary advisor (arsenic in drinking water, chelation of heavy metals) • Consultant to US Air Force Science Advisory Board (F-22) • Consultant to the...

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Allen C Bowling, MD, PhD

NeuroHealth Institute

Englewood, Colorado

Neurology, Pharmacology - general neurology, back pain, neck pain, neuropathic pain, headache, traumatic brain injury (TBI), spasticity, alternative medicine, chiropractic, complementary medicine, diet, dietary supplements, herbs, integrative medicine, marijuana, multiple sclerosis, nutrition, pharmacology, vitamins

Allen C. Bowling, MD, PhD, is Director of the NeuroHealth Institute and is Clinical Professor of Neurology at the University of Colorado. Dr. Bowling’s areas of expertise include general neurology, back pain, neck pain, neuropathic pain, headache, traumatic brain injury (TBI), spasticity, multiple sclerosis (MS), and pharmacology. He also has expertise in cannabis (marijuana), dietary supplements, herbal medicine, chiropractic, and alternative medicine. He has more than 100 lay and professional publications, including five books, and has been a principal investigator in more than 20 clinical trials. Dr. Bowling is a Summa Cum Laude and Phi Beta Kappa graduate of Yale, where he also obtained his MD and a PhD in pharmacology. He completed his neurology residency training at the University of California-San Francisco and his fellowship training at Massachusetts General Hospital-Harvard Medical School. In 2016, he received the Neuroscientist of the Year Award from the Colorado Neurolo...

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Michael J Kosnett, MD, MPH, DFACMT

Medical Toxicology and Occupational/Environmental

Denver, Colorado

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Ted Menadier, MBA

The Business and Cultivation of Marijuana and Hemp

Approach One LLC

Denver, Colorado

Cannabis, Law Enf & Criminal Justice - Business of Marijuana, Marijuana Cultivation, Hemp Cultivation, Cannabis Propagation, Cannabis Nursery, Marijuana Expert Witness, Marijuana Crop Valuation, Marijuana economic Damages, hemp, CBD, Cannabis, marijuana, marijuana Market Analysis, Hemp Expert Witness, Hemp, Medical Marijuana

I am an expert in the business and cultivation of marijuana and hemp. Over the last four years, I have been retained and provided expert services in over 30 cases and insurance claims. I have experience providing opinions in both State and Federal courts and testifying at depositions and trials. My mix of industry experience and business education (MBA) makes me uniquely qualified to address many issues within the Marijuana and Hemp industries. My business education allows me to analyze markets and a business’s strengths and weaknesses and assess economic impacts in a manner supported by relevant industry, market data, and other relevant documentation. In addition to continuing expert witness case work, I maintain relationships throughout the cannabis industry and credentials to work within it so that I can stay up to date as the industry evolves. My experience in indoor and outdoor cannabis cultivation and business practices gives me first-hand knowledge of industry pract...

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Dr. David H. Schaffer, MD, MRO

Toxicology Director, Experienced Witness, Dual BC

Florida

Toxicology, Emergency Medicine - Drug Testing, Toxicology, Overdose, Drug Levels, Chemical Exposure, Alcohol, Fentanyl, Carbon Monoxide, Poisoning, Opioids, Med Mal, Medical Toxicology, Marijuana, Impairment, Methamphetamine, Opiates, Child Custody, Drugs, Toxic Tort, Hair Testing

Dr. David H. Schaffer, MD, MRO is dual-boarded in both Medical Toxicology and Emergency Medicine, serving as the Director of Medical Toxicology at the University of South Carolina School of Medicine in Greenville, SC and Prisma Health–Upstate hospitals. He is also a certified Medical Review Officer (MRO, MROCC). Dr. Schaffer has published extensively in the fields of Medical Toxicology and Emergency Medicine. Outside of clinical practice and the occasional courtroom appearance, Dr. Schaffer has also consulted for major organizations—including SpaceX, Butterfly Network, and governmental entities—on a variety of clinical matters. Dr. Schaffer earned his medical degree from the University of North Carolina School of Medicine, completed his residency at Harvard, where he served as a Clinical Fellow at Harvard Medical School, and subsequently trained in Medical Toxicology at the University of Virginia. He is a practicing physician with extensive publications and speaking records, is reg...

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Cheska Richards, PhD, NRCC

Forensic Toxicologist w federal court experience

SAINT PETERSBURG, Florida

Toxicology, Laboratories & Testing - drug testing, opiate, hearing, exposure, dermal, false positives, fentanyl, methamphetamine, inhalation, touch exposure, toxicology, Delta 8, cocaine, environmental exposure, low level, residual, Marijuana, passive, metabolism, elimination

I am a PhD-level forensic and clinical toxicologist with over a decade of experience advising organizations, attorneys, and courts on complex toxicological, pharmacological, and regulatory matters. I served as the toxicologist for the federal courts drug testing contract for 3 years. In that role I testified at federal revocation hearings over 20 times concerning drug testing and wrote hundreds of formal letters of data interpretation for the courts. I also corresponded with attorneys and probation when the drug testing outcome may have been due to exposure or medication or diet. I have a National Registry of Certified Chemists board certification as a Toxicological Chemist, a MS and a PhD, and many years of experience directly operating laboratories.

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Alexandra Funk, PharmD, DABAT, FAACT

Funk Rothstein Toxicology Consulting

Tampa, Florida

Toxicology, Pharmacology- Clinical - Postmortem toxicology, overdose, poisoning, drugs of abuse, opioids, street drugs, prescription medications, over-the-counter medications, medication errors, ethanol, alcohol, DUI, marijuana, breastmilk drug transfer

Dr. Alexandra Funk is a board certified clinical toxicologist and licensed pharmacist with experience in toxicology, poison center management, pharmacology, emergency medicine, and hospital pharmacy practice. Dr. Funk regularly consults on toxicology cases in the state of Florida involving drugs of abuse, prescription medications, and over-the-counter medications in persons of all ages. Dr. Funk provides educational opportunities for both healthcare professionals and the lay public. Dr. Funk is actively involved as a member and in leadership roles within the organizations of American Academy of Clinical Toxicology, America's Poison Centers, and American Board of Applied Toxicology.

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Leon M Gussow, MD

Chicago, Illinois

Toxicology, Emergency Medical Toxicology - Alcohol, Poisoning, opiates, opioids, Marijuana, Overdose, Cannabinoids, cannabis, intoxication, Drug Screening, Dram Shop, Drug Testing, Carbon Monoxide

Over 20 years experience providing consultation and expert witness testimony in cases involving topics including alcohol, marijuana, carbon monoxide, adverse drug effects, drug tests, and urine drug screens. Extensive teaching experience with the Toxikon Consortium Medical Toxicology Fellowship Program in Chicago. Fellow, American College of Medical Toxicology; Board Certified in Emergency Medicine and Internal Medicine; Medical Consultant, Illinois Poison Control Center; Peer Reviewer, Clinical Toxicology; Peer Reviewer, Journal of Medical Toxicology; Peer Review, Emergency Medicine Journal; Peer Reviewer, Cleveland Clinic Journal of Medicine.

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Daniel L Overbeek, MD

Toxicology / Addiction / Emergency Harvard Trained

J.S. Held

Grand Rapids, Michigan

Emergency Medical Toxicology, Toxicology - Kratom, Dram Shop & Alcohol Services, Drug Testing, Alcohol, Intoxication, Vaping, Overdose, Drugs, Methanol, Emergency Medicine, Urine Drug Screen, Fentanyl, Dram Shop, Toxic Tort, Marijuana, Mitragynine, Addiction, Ethanol, Substance Abuse, Addiction Medicine

"Good to hear from you! You were honestly one of my favorite experts to work with - not just on that case, but thus far in my career. " - Partner at National Law Firm Dr. Daniel Overbeek is Board Certified in Emergency Medicine, Medical Toxicology and Addiction Medicine. Dr. Overbeek was trained at the Harvard Medical Toxicology Fellowship after completing the University of Michigan Emergency Medicine residency in Ann Arbor, MI. He is also published on a variety of medical toxicology topics, including drug testing, alcohol and methanol, kratom / mitragynine, cannabis, vaping and electronic cigarettes. At J.S. Held, Dr. Overbeek provides medical toxicology and human health risk consulting services to attorneys, corporations, and public entities. His work includes medical record review, exposure and dose reconstruction, adverse event analysis, regulatory and safety evaluation, expert report preparation, deposition support, and trial testimony in high stakes matters. Dr. Overbeek ...

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Karen Mollner, DMSc, MPAS, MS, PA-C

Emergency Medicine PA-C, DMSc, MS toxicology

Hugo, Minnesota

Emergency Medicine, Toxicology - emergency, wrongful death, fentanyl, trauma, marijuana, toxicology, criminal, sepsis, medication, alcohol, malpractice, dissection, occupational, narcotics, physician assistant, cardiac, insurance

Over 22 years experience in Emergency Medicine and Toxicology. Affiliate Member American College of Medical Toxicology with masters degree in forensic toxicology. Doctorate of Medical Science with focus in emergency management. Over 8 years experience as expert witness including medicolegal, emergency medicine, toxicology, occupational, insurance companies, wrongful death, criminal. Website www.thealcoholpro.com

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Caitlin Bonney, MD, FACEP

Correctional Addiction Medicine Toxicologist

Nevada

Emergency Medical Toxicology, Addiction Medicine - carceral medicine, correctional medicine, emergency medicine, opioid use disorder, overdose, intoxication, detoxification, withdrawal, substance use disorder, drug of abuse, fentanyl, alcohol, jail and prison medicine, marijuana, cannabis, hyperactive/excited delirium, buprenorphine, methadone, drug-facilitated sexual assault

Dr. Caitlin Bonney, MD, FACEP, brings over 11 years of experience as a board-certified Emergency Medicine physician, Medical Toxicologist, and Addiction Medicine specialist with extensive experience providing and leading substance use disorder care in carceral settings. She currently serves as the Medical Director of Addiction Medicine for a large metropolitan detention center, where she oversees a comprehensive jail-based addiction treatment program serving hundreds of incarcerated individuals. Dr. Bonney’s work in correctional health focuses on the clinical, operational, and regulatory aspects of delivering evidence-based addiction care in jails and prisons. Her experience includes program development and scale-up, including development of an opioid treatment program (OTP or “methadone clinic”); intake screening and withdrawal management protocols; implementation and oversight of medications for opioid use disorder, including buprenorphine and methadone; coordination with custo...

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Caitlin Bonney, MD, FACEP

Correctional Addiction Medicine Toxicologist

Albuquerque, New Mexico

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Richard A Stripp, Ph.D.

American Scientific Consultants Corp

Huntington, New York

Toxicology, Pharmacology - Forensic toxicology, alcohol, drugs of abuse, dui, dwi, dram shop, prescription pain drugs, cocaine, heroin, pcp, amphetamine, overdose, carbon monoxide, lead, heavy metals, opiates, marijuana, THC

Dr. Richard Stripp is a nationally recognized expert in toxicology providing services in all aspects of a clinical and forensic toxicology. He has served as an expert consultant in 100’s of cases in the field of toxicology and pharmacology for attorneys, investigators, and physicians involved in forensic and clinical toxicological evaluations associated with ethanol, drugs of abuse, prescription medications and chemical exposure. Dr. Stripp provides unbiased expert case reviews involving drug effect on human performance, toxicity of iatrogenic/ therapeutic agents, lead and other toxic metals, carbon monoxide and environmental/occupational hazards. These services include, impartial evaluations involving drug impairment, overdose, toxic chemical exposure, medical issues associated with drug therapy, poisoning, and the role of drugs, alcohol, or chemical exposure in civil and criminal litigation. This covers a full breath of forensic medical-legal cases

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Bethany Pridgen, MFS

Toxicology and Seized Drug Expert

The DEVAUS Group, LLC

Wilmington, North Carolina

Forensic Science, Toxicology - Controlled substances, DWI, DUI, retrograde extrapolation, driving while impaired, alcohol, drunk driving, cannabis, THC, marijuana, CBD, hemp, quality assurance, ISO 17025, laboratory management, laboratory accreditation, dram shop, back extrapolation, SFST, DRE

Bethany has worked in the forensic science industry since 2005. She provides expert witness testimony and consultation for criminal and civil matters involving, but not limited to, DUI, seized drugs, cannabis, forensic testing practices, laboratory management, quality assurance standards, and reliability of testing methods. Early in her career, she had the opportunity to open a new regional forensic science laboratory in southeastern NC. She began an 11 year journey and gained a career’s worth of experience as a laboratory director, quality assurance manager, laboratory scientist, grant writer and manager. She has written and reviewed hundreds of administrative and technical policies, procedures, and training programs, and has analyzed and provided final review of thousands of biological and seized drug samples. She is a lead and technical assessor for ISO 17025:2017 and performs assessments in the areas of quality management, toxicology, and seized drugs testing for ANAB and A...

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Shannon C. Miller, MD, DFASAM, DLFAPA

Addiction Medicine

Forensic Addiction & Psychiatric Services, LLC

Cincinnati, Ohio

Addiction Medicine, Psychiatry - Alcohol, Gambling, Heroin, Opiate, Fentanyl, Nicotine, Vaping, e-cigarette, Cannabis, Marijuana, Sedative, Phenibut, Xylazine, GHB, LSD, DMT, MDMA, Dextromethorphan, PCP, Ketamine

“FREE INITIAL CONSULTATION. Updated CV available at www.forensicaddictions.com. Consultation on issues relating to alcohol/drug use, addiction, gambling, etc. Active clinical practice for 3 decades in Addiction Medicine, broadly experienced. Direct clinical experience specializing in addictions, including government and private practice, both inpatient and outpatient withdrawal management, rehabilitation, co-occurring psychiatric disorders, corrections, methadone, buprenorphine, chronic pain, drug testing, impaired providers, gambling, and a wide array of addiction-related disorders. Board Certified in Addiction Medicine, Board Certified in Psychiatry. Distinguished Fellow, American Society of Addiction Medicine, Distinguished Life Fellow of the American Psychiatric Association. Editor of largest and perhaps most read Addiction Medicine textbook worldwide, and for 4 editions over a 20-year span. Previously served 10 years as co-founding Co-Editor of a leading addiction medicine...

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Heath Jolliff, DO

Medical Toxicology and Forensics Expert

Mid-Ohio Toxicology Services, LLC

Columbus, Ohio

Toxicology, Emergency Medical Toxicology - Forensic toxicology, Drug Abuse, Overdose, Impairment, Marijuana, Alcohol, Drug testing, DUI, Risk assessment, Cannabis, Opioids

Board Certified in Emergency Medicine and Medical Toxicology. Fellowship trained at the University of Colorado/Rocky Mountian Poison and Drug Center. Over 3 decades of clinical experience. Expert forensics work for over 2 decades Active Medical License in Colorado and Ohio Fellow, American College of Medical Toxicology Previous, Medical Toxicology Fellowship Program Director

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Nina M. French

Workplace Drug Testing and Cannabis Expert

Capwell Consulting Group

Meadowbrook, Pennsylvania

Substance Abuse, Cannabis - Employment Drug Testing, Workplace Safety, DOT Compliance, Drug Testing Regulations, Cannabis Testing, Occupational Health, Urinalysis, Alcohol Testing, Oral Fluid Testing, SAMHSA Compliance, Substance Testing Regs, Drug Lab Analysis, State Cannabis Regulations, Drug Testing Laws, Impairment, Saliva Testing, Marijuana, Drug Screen

Leading substance abuse industry drug and alcohol testing authority with over 30 years of industry experience, serving as an expert witness, litigation consultant, and policy advisor in matters involving workplace drug testing, impairment assessment, and regulatory compliance. Proven expertise in federal regulations and state drug testing law, including DOT, SAMHSA, ADA, cannabis, and state-specific laws. Extensive background in designing compliant, defensible testing programs, and providing authoritative opinions involving wrongful termination, discrimination, and workplace safety claims. Skilled in translating complex scientific, regulatory, and operational issues into clear, court-ready testimony. Nina is a frequent presenter and author as a workplace safety and drug testing expert. Ms. French has served as the past President of the Drug & Alcohol Testing Association (DATIA) and is currently a member of the Scientific Advisory Board of the Impairment Science Organization (DRUID).

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Allison A. Muller, PharmD, DABAT, FAACT, AFACMT

Board-Certified Toxicologist - Penn/CHOP Faculty

Acri Muller Consulting, LLC

Aston, Pennsylvania

Toxicology, Pharmacology- Clinical - opioids, carbon monoxide, marijuana, cannabis, impairment, DUI, drugs, medication errors, overdose, postmortem, toxicity, medications, drug testing, adverse event, dietary supplement, kratom, fentanyl, oxycodone, lithium, mold

Board-certified toxicologist. Fellow of the American Academy of Clinical Toxicology. Affiliate Fellow of the American College of Medical Toxicology. Registered pharmacist. Over 30 years of experience in the field of clinical toxicology. Two decades as a clinical toxicologist and managing director at the Poison Control Center at The Children’s Hospital of Philadelphia (CHOP), consulting on toxicology cases from 21 counties in Pennsylvania and Delaware. Expert witness experience has involved cases related to alcohol, drugs of abuse (ie, opioids, marijuana, synthetic cannabinoids, cocaine), carbon monoxide, medication errors, and postmortem toxicology. Extensive teaching experience including as faculty at the University of Pennsylvania School of Veterinary Medicine. *Please note that I am only able to work on cases with licensed attorneys.

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Dr. David H. Schaffer, MD, MRO

Toxicology Director, Experienced Witness, Dual BC

Greenville, South Carolina