dr. sam jacobton. >> can you explain what it is about sarin that is so particularly awful? >> this is like a pesticide on humans, anderson. it's lethal and works fast and this sticks everything in the on mode so everything is just going on and stays on. your eyes water and nose runs and muscles seize up. it's very painful. the diaphragm arcs louing to breathe becomes paralyzes and causes someone to die. it's a terrible thing and this effect on the body can happen within minutes. >> why is it harder to detect when it is used? >> when looking at sarin gas,