Methiocarb is also a known poison to water organisms.

"I want to be tested for every known poison," Ryan said.

Although lead is a known poison, the mechanical and chemical characteristics of the metal continue to keep lead as an important component in many products.

"To test something that's a known poison merely to advance corporate profits is not appropriate."

He said "no known poison was detected."

We routinely dose ourselves with every known antidote to every known poison.

It's no known poison, the symptoms are those of no known disease.

They all dose themselves with antidotes to every known poison.

As we have heard, in the dead of night on 2 December 1984, a deadly 40 tonnes of known and unknown poisons leaked into the air.