Convictions questioned over outdated fire science

Associated Press Clare Bradburn pauses for a photo Jan. 20 in Dallas.  

 Inmate Ed Graf is escorted out of the visiting area after an interview March 11 at the Alfred Hughes State Prison in Gatesville, Texas. Despite his pleas of innocence, Graf was given life in prison 25 years ago for killing his two stepsons by locking them in a backyard shed and setting it on f...