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A woman was groped at the University of Utah. Skin cells on her clothing helped investigators catch her attacker.

The use of touch DNA in that “groundbreaking” case changed the way evidence is collected. Now, a BYU researcher is sharing this method with others.

(Chris Detrick | The Salt Lake Tribune) Julie Valentine poses for a portrait at Brigham Young University Friday, June 3, 2016. Valentine, who is the associate dean of undergraduate studies and research at Brigham Young University’s College of Nursing and a member of Wasatch Forensic Nurses, has worked in recent years to show how touch DNA can be used in groping and sexual assault cases.