DNA Security discovered the DNA of at least two males in the accuser’s rectum that did not match the Defendants, their lacrosse teammates, or anyone else who provided a reference DNA sample.
While we know that it's at least theoretically possible that semen can be detected in the vagina for up to a week after intercourse, it's highly unlikely that the same can be said for the anus. The accuser stated to police that she had had no sexual contact with anyone since the previous weekend and that individual had been her boyfriend. That makes this and other DNA evidence incredibly exculpatory. If we take her at her word, this DNA could have only come from her alleged attackers and we also know through the matching that her attackers could not have been a lacrosse player.