there is no way to kill yourself that way. >> when a person ingests arsenic, the poison attaches itself to the hair follicles. as the hair grows, the poison residue remains on the hair shaft and becomes a permanent record. so scientists cut nancy's hair into 7-millimeter pieces. each piece corresponded to a two-week period. each piece was placed in a separate vial and then exposed to radiation in a nuclear reactor. >> the sample can be analyzed as is in most cases, just simply weighed into a radiation vial. most other methods require dissolution of the sample. >> when scientists examine the hair with gamma ray spectrophotometry, they discovered a startling piece of