ROANOKE, Va. (AP) _ A former office worker at a Roanoke medical practice has pleaded guilty to illegally using the employer’s federal drug registration number to prescribe painkillers and sleeping pills for family members and others. Acting U.S. Attorney Anthony Giorno says 63-year-old Vicki Chilton Mullen of Roanoke pleaded guilty to six drug fraud and distribution charges Wednesday. Her son, 39-year-old Daniel Mullen of Vinton, pleaded guilty to the same charges. According to prosecutors, Vicki Mullen called in unauthorized prescriptions for years, allowing four people to illegally obtain more than 130,000 pills that they consumed or distributed. Gregory Mullen and others provided personal information of other people so Vicki Mullen could call in prescriptions in those individuals’ names without their knowledge. Two other people previously pleaded guilty and two face charges in the scheme.