**FILE** This undated photo provided by the U.S. Attorney's Office in New Hampshire shows David Kwiatkowski, a former lab technician at Exeter, N.H., who is accused of infecting patients in multiple states with hepatitis C through tainted syringes. Kwiatkowski, who has admitted stealing painkillers and replacing them with saline-filled syringes tainted with his blood, pleaded guilty to 16 federal drug charges. (Associated Press/U.S. Attorney's Office)

Photo by: Uncredited

**FILE** This undated photo provided by the U.S. Attorney's Office in New Hampshire shows David Kwiatkowski, a former lab technician at Exeter, N.H., who is accused of infecting patients in multiple states with hepatitis C through tainted syringes. Kwiatkowski, who has admitted stealing painkillers and replacing them with saline-filled syringes tainted with his blood, pleaded guilty to 16 federal drug charges. (Associated Press/U.S. Attorney's Office)