In photo taken Wednesday, Sept. 12, 2012, Dr. David Mathis examines an inmate who was brought into the emergency room for chest pains at the California Medical Facility in Vacaville, C

 

              In  photo taken Wednesday, Sept. 12, 2012, Dr. David Mathis examines an inmate who was brought into the emergency room for chest pains at the California Medical Facility in Vacaville, C
In photo taken Wednesday, Sept. 12, 2012, Dr. David Mathis examines an inmate who was brought into the emergency room for chest pains at the California Medical Facility in Vacaville, Calif. Mathis, a board certified physician, was the highest paid prison doctor last year, earning a base salary of $239,572 and an additional $169,548 for working overnight shifts, weekends and holidays. Prison doctors say they are worth the higher pay because they face the constant threat of assault from inmates. (AP Photo/Rich Pedroncelli)