In this photo taken Wednesday, Sept. 12, Dr. David Mathis looks over some papers as he walks through one of the housing units of the California Medical Facility in Vacaville, Calif. M

 

              In this photo taken Wednesday, Sept. 12,  Dr. David Mathis looks over some papers as he walks through one of the housing units of the California Medical Facility in Vacaville, Calif.  M
In this photo taken Wednesday, Sept. 12, Dr. David Mathis looks over some papers as he walks through one of the housing units of 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)