A stain contained higher levels of polonium-210 than a typical sample , a scientist says . Score: 6 `` There is sufficient evidence '' Yasser Arafat was killed , PLO official says . Bochud also said the Institut de Radiophysique did not verify that the clothing was Arafat 's ; another organization concluded that the DNA on the items was similar to that of Arafat 's daughter . Use of polonium-210 as a poison `` does seem a bit of a stretch , '' toxicologist says .
A stain contained higher levels of polonium-210 than a typical sample , a scientist says . Score: 6 `` There is sufficient evidence '' Yasser Arafat was killed , PLO official says . Use of polonium-210 as a poison `` does seem a bit of a stretch , '' toxicologist says .