Cops probing the horrific murders of four University of students face a 'major challenge' recovering samples of the killer's DNA because of the amount of blood at the scene, a forensics expert has said.Joseph Scott Morgan, a forensics professor at Jacksonville State University, said as the killer moved from victim to victim, there would be a 'commingling of blood' that makes it 'difficult to distinguish individual samples'.Police are yet to name a suspect in the murders of Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Xana's freshman boyfriend, Ethan Chapin, 20.
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