A Message from Dr. William R. Sawyer
Chief Toxicologist, TCAS, LLC
Hazardous substance toxicology requires application of scrupulous attention to
detail and methodology. Many years of experience are a virtue in conducting such
assessments, particularly in cases involving widespread contamination.
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.