They include arsenic, which can be used to kill plants and small animals.

VOA: special.2010.03.09

Also,Bolivar traveled and battled extensively, in Peru and other mountainous areas where arsenic is a common mineral found in ground water.

VOA: standard.2010.06.09

The best treatment available was arsenic, so that was what people reached for when they had unexplained health problems."

VOA: standard.2010.06.09

One is an arsenic-based drug that kills five percent of users.

VOA: standard.2010.04.05

Yes,arsenic. But not poisioning by political enemies, as in an assassination.

VOA: standard.2010.06.09

Arsenic was their aspirin, their common painkiller.

VOA: standard.2010.06.09