in medical laboratories and university laboratories. reporter: that could explain why authorities used search warrants and subpoenas to search the lab where klein s husband works. a source close to the investigation confirms cyanide was found in his lab. but neighbors say there was no indication of trouble in the home. she was very happy. she was very relaxed. reporter: dr. ferante s attorney says authorities are looking at his client. i m sure what do they call it, person of interest or suspect. i don t think there s any doubt about that. reporter: pittsburgh authorities would not comment about whether he is the primary focus of suspicion, saying the investigation s being handled by homicide detectives, but no suspect has been named. lieutenant kevin krause, commander in charge of the major crimes unit for the pittsburgh police, tells us dr. klein s death is being treated as a suspicious death investigation.
i d say extremely rare. reporter: cyanide is so deadly, bloom says, an amount the size of a baby aspirin can kill. but it s not supposed to be easy to get. the most likely place that you would find cyanide would be in medical laboratories and university laboratories. reporter: that could explain why authorities used search warrants and subpoenas to search the lab where klein s husband works. a source close to the investigation confirms cyanide was found in his lab. but neighbors say there was no indication of trouble in the home. she was very happy. she was very relaxed. reporter: dr. ferante s attorney says authorities are looking at his client. i m sure what do they call it, person of interest or suspect. i don t think there s any doubt about that. reporter: pittsburgh authorities would not comment about whether he is the primary focus of suspicion, saying the investigation s being handled by homicide detectives, but no
the source close to the investigation says the levels in her system were enough to make her collapse in 30 seconds. but how did she get it? police looked at three possibilities. suicide, accident, or murder. dr. klein s parents say their daughter would never have killed herself. she had too much to live for. there was even talk of having another child. so i picked up the phone and called deborah bloom. she wrote the book on poison, the poisoner s handbook. how likely is it to be an accident? i d say extremely rare. reporter: cyanide is so deadly, bloom says, an amount the size of a baby aspirin can kill. but it s not supposed to be easy to get. the most likely place that you would find cyanide would be in medical laboratories and university laboratories. reporter: that could explain why authorities used search warrants and subpoenas to search