In this photo taken Wednesday, Sept. 12, 2012, Dr. David Mathis, center, talks with cancer patient, inmate Luis Duran in the hospice unit at the California Medical Facility in Vacaville, Calif. Mathis, a board certified physician, and is the acting medical director a the prison hospice, 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)
