Alaskan criminal detectives believed they had nabbed a criminal when they uploaded a DNA sample to a database in 2004. There was only one issue: the man was in jail at the time of the incident. But DNA samples are perfect, correct?

It turned out that the criminal’s sibling had undergone a bone marrow transplant. He was found guilty, and a year after, crime detection scientist Abirami Chidambaram presented the evidence in 2005. This is the exact situation that Chilton was referring to.