ran down to the library and i got out a book on toxicology and i also went on to something called medline on the computer. >> the medical literature described some possible causes. when her doctor factored in her other symptoms -- numbness of her hands and legs, disorientation and nausea, the answer became clear. >> i was able to complete the description of arsenic in my mind, and it fit her perfectly. >> arsenic is a heavy metal poison and not one you normally encounter. further testing indicated debbie had an arsenic level of 29,580 micrograms per liter, one of the highest ever recorded in a living person. >> almost sounded like a mistake in the lab reading, but it wasn't. >> the amount i had, i shouldn't be here. >> she was immediately put under 24-hour security protection. but the question remained, how was she poisoned, and who wanted her dead? dad: so who's going to do what? boy: i'll pack the dead batteries. dad: great. girl: i'll only put what i don't need into a duffle bag. perfect. that's totally unhelpful. no problem. meanwhile, i will try to comfort everyone by speaking in a c