brigida uto was clinging to life in the icu. her doctor had a hunch she had been poisoned and core press raised alarms at the fbi. now her test results were about to solve one piece of the mystery. send the case in a chilling new direction. returning to natalie with the prussian blue mystery. >>> brigida's mom could not visit her daughter in the hospital. no visitors were allowed. she waited and she prayed. that is all she could do. 30 miles away at kaiser hospital, dr. lapoint was waiting too. three days had passed since he sent out brigida's samples. brigida in pain the whole time. finally, the lab results came back just as he suspected. it was thallium. a lot of it. brigida's husband and young son seem to be clear the toxic mental but she was in serious danger. >> her levels were off the charts. >> more than 1000 times the acceptable level. that is unbelievable. a hospital staffer had driven through the night to get hold of prussian blue pills. dr. lapoint started brigida on them immediately , but was so much thallium in brig