 In 2015, Chelsea Rustad, a resident from Tumwater, Washington, used a decades-old Halloween photo of herself to enter an Ancestry DNA contest, winning herself a DNA spit kit and using it to build an open website called GEDmatch. Rustads DNA was later used by detectives to connect evidence from the crime scene to her cousin, ... Chelsea Rustad story: How did a Halloween photo lead to a killer?... 