Over two decades ago, not long after he got out of Texas prison for robbery, Ray Hill got a job at his local public radio station, KPFT in Houston. He started a weekly program about Texas prisons that's now the leading muckraking voice in the state when it comes to exposing graft and corruption in prison facilities there. He also does something else that makes it one of the most unusual and remarkable radio programs in the country: For most of an hour, he takes calls from people whose families are in prison; they talk to their loved ones behind bars, over the radio. Ray explains, and we hear clips from his show. (14 minutes)