clothing. you might recall arafat died in 2004. he was last seen live in ramallah boarding a helicopter to begin a journey to military hospital in france where he died two weeks later. the official cause of death is listed as a stroke. many palestinians believe he was poisoned by israel. that something israel denies. the bottom line here in life he was controversial and in death, bill, he also remains very controversial. bill: what is this pallonium poison? >> it is a radioactive element that can be extremely, extremely deadly. according to u.s. regulatory, nuclear regulatory commission it emits radiation that can essentially destroy human tissue. it can not we are told penetrate skin. if ingested it can cause deadly harm to dna, to main body organs and as well as we are told the immune system. and this particular isotope