In 1974, AACT played a crucial role in establishing the American Board of Medical Toxicology (today the American College of Medical Toxicology) to allow for physicians to be board certified as clinical toxicologists.

He was the clinical toxicologist who dealt with the poisoning case of Russian dissident Alexander Litvinenko (at University College Hospital) in November 2006.

Most kidney, heart and liver transplant patients experiencing severe organ rejection appear to be responding well to the drug, OKT3, said Dr. Timothy J. Schroeder, a clinical toxicologist at the University of Cincinnati Medical Center.

Regardless, most clinical toxicologists will administer additional charcoal if serum salicylate levels are increasing.

Dr. John Henry, a clinical toxicologist who is treating Mr. Litvinenko, told reporters that his patient "has some symptoms consistent with thallium poisoning and he's also got symptoms consistent with some other type of poisoning, so it's not 100 percent thallium."

Dr. John Doull, a clinical toxicologist at the University of Kansas in Kansas City, also was a member of the advisory board that reviewed the previous dioxin report.

Rose Ann Soloway, a clinical toxicologist who administrates the American Association of Poison Control Centers in Washington, said her group was not aware of any cases of sarin poisoning in the United States in the past.

A. "It is extremely toxic," said Dr. Larry J. Thompson, a clinical toxicologist in the College of Veterinary Medicine at Cornell University in Ithaca, N.Y."It is one of the most toxic plants on anyone's list."

John Henry, a clinical toxicologist who has been treating Mr. Litvinenko, told the BBC: "He's got a prospect of recovering.

Whether chronic alcoholism should be considered a risk factor has been debated by some clinical toxicologists.