TCAS
Toxicology Consultants & Assessment Specialists, LLC

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Drugs of Abuse   Toxic Substances: Drugs of Abuse
Drugs of abuse are well-documented in the peer-reviewed toxicological literature. a TCAS has provided toxicological guidance, written assessments and expert testimony in hundreds of drug-related cases. Virtually all drugs of abuse are well-documented in the peer-reviewed toxicological literature with clearly-established endpoints. However, drugs of... (more)

Toxicology of Pharmaceuticals   Toxic Substances: Toxicology of Pharmaceuticals
TCAS has broad experience with pharmaceutical toxicology. a TCAS has wide experience with pharmaceutical toxicology and has performed many assessments involving prescription medications, drugs of abuse, vaccines and over-the-counter preparations. Although pharmaceutical use can be a significant toxicological factor in a variety of claims, the real... (more)

Hair Samples Yield Incorrect Cocaine Use Conclusion   Case Studies in Toxicology: Hair Samples Yield Incorrect Cocaine Use Conclusion
This case study recounts the circumstances relating to a teacher faced with pending dismissal for alleged drug use based on erroneous interpretation of cocaine in hair test samples. This case illustrates the importance of applying a correct, peer-reviewed scientific methodology to laboratory analyses and interpreting the results in line with established... (more)

Window Washer's Deadly Fall Due to Heroin Abuse?   Case Studies in Toxicology: Window Washer's Deadly Fall Due to Heroin Abuse?
This case study summarizes a matter in which a window worker was killed while on the job, resulting in the filing of a lawsuit for negligence. It illustrates how toxicological interpretation of historical factors and application of peer-reviewed human studies can play a pivotal role in litigation. A window washer suddenly and unexpectedly fell to his... (more)

Workmen's Compensation Benefits Denied for Presumed Drug Use?   Case Studies in Toxicology: Workmen's Compensation Benefits Denied for Presumed Drug Use?
This case study summarizes a recent matter in which a worker was injured while on the job, then later denied Workmen's Compensation benefits when drug use was alleged. It illustrates the key importance of rebutting presumptions through objective assessment of clear and convincing toxicological evidence. A lineman working on power lines received a serious... (more)

Professional Experience and Toxicological Specializations   Professional Experience and Toxicological Specializations
TCAS has assessed hundreds of different types of toxic substances and exposure effects. [a] TCAS provides professional, comprehensive forensic and environmental exposure analysis, risk assessments and causation determinations. With more than 28 years of hands-on experience, our cases cover a vast range of toxic exposure-related issues combining toxicological... (more)

Dr. William R. Sawyer, Toxicologist   Home: Dr. William R. Sawyer, Toxicologist
Ph.D., Diplomate, American Board of Forensic Medicine D-ABFM Dr. William R. Sawyer is an expert forensic toxicologist For more than 28 years expert toxicologist Dr. William R. Sawyer has been providing forensic toxicology consulting services and expert testimony. A diplomate of the American Board of Forensic Medicine, Dr. Sawyer has extensive experience... (more)

Curriculum Vitae: William R. Sawyer, Ph.D., D-ABFM   CV: Curriculum Vitae: William R. Sawyer, Ph.D., D-ABFM
Diplomate, American Board of Forensic Medicine Introduction Dr. William Sawyer is a professional toxicologist with a doctorate in toxicology from Indiana University School of Medicine. He is a diplomate of the American Board of Forensic Medicine with more than 28 years of experience in public health and forensic toxicology including five years of governmental... (more)

Site Map   Site Map
Toxicology Consultants and Assessment Specialists, LLC TCAS has devoted its website to the role of the expert toxicologist and the science of toxicology. The following pages present both original and edited public-domain information compiled as a useful educational resource. This site map is a content reference intended to assist with rapid location... (more)

A Message from Dr. William R. Sawyer
Chief Toxicologist, TCAS, LLC

A message from Dr. William R. Sawyer, Expert Toxicologist

"Assessing the direct and indirect impacts of drugs of abuse requires close attention to detail. Adhering to generally-accepted, peer-reviewed methods and the results of human studies are the best ways to ensure credible results that will stand up to scientific scrutiny."

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This is an informational and instructional website devoted to toxicology. It presents both original and edited public-domain content compiled as a useful educational resource. References and footnotes have been included wherever possible and image sources have been cited where appropriate. Although most pages can be printed or downloaded as PDF files (and we encourage you to make constructive use of our information), this website is copyrighted and material may only be reproduced and/or distributed with prior permission from TCAS, LLC.