Clare Bradburn is pauses for a photo Wednesday, Jan. 20, 2013, in Dallas. Bradburn's ex-husband, Ed 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 fire. Two investigators used photos of the shed’s remains to persuade jurors that Graf had started the fire intentionally killing Bradburn's sons. Authorities in Texas and in other states are beginning to re-examine old arson cases in which defendants may have been convicted with questionable scientific evidence. (AP Photo/Kim Johnson Flodin)

Associated Press
Clare Bradburn is pauses for a photo Wednesday, Jan. 20, 2013, in Dallas. Bradburn's ex-husband, Ed 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 fire. Two investigators used photos of the shed’s remains to persuade jurors that Graf had started the fire intentionally killing Bradburn's sons. Authorities in Texas and in other states are beginning to re-examine old arson cases in which defendants may have been convicted with questionable scientific evidence. (AP Photo/Kim Johnson Flodin)
Clare Bradburn is pauses for a photo Wednesday, Jan. 20, 2013, in Dallas. Bradburn's ex-husband, Ed 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 fire. Two investigators used photos of the shed’s remains to persuade jurors that Graf had started the fire intentionally killing Bradburn's sons. Authorities in Texas and in other states are beginning to re-examine old arson cases in which defendants may have been convicted with questionable scientific evidence. (AP Photo/Kim Johnson Flodin)
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