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Photo by: M. Spencer Green
This photo taken Nov. 30, 2012, in Chicago shows three vials of mass murderer John Wayne Gacy's blood recently discovered by Cook County Sheriff's detective Jason Moran. The sheriff’s office is creating DNA profiles from the blood of Gacy and other executed killers and putting them in a national DNA database of profiles created from blood, semen, or strands of hair found at crime scenes and on the bodies of victims. What they hope to find is evidence that links the long-dead killers to the coldest of cold cases and prompt authorities in other states to submit the DNA of their own executed inmates and maybe evidence from decades-old crime scenes to help them solve their own cases. (Associated Press)

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