Sarin is a highly poisonous nerve agent. It is a man-made chemical that can cause severe harm to the human body and even death if exposed. Full definition
This is in contrast to an incident one year ago in which U.S. intelligence agencies had video and other evidence of certain aspects of the actual attack, which involved the use of Sarin gas. (macleans.ca)
Only a fool would choose a posionous concoction made out of sarin nerve gas! (newscientist.com)
Iraq probably retains several tons of the highly toxic VX substance, as well as sarin nerve gas and mustard gas. (politics.stackexchange.com)