NOTHING!!
Bet her "weekend" clients (3) were part of an "on file" data base. Crystal didn't have to squeal. They knew. It was just a matter of getting into the right data base.
The fact that there were 3 sets of DNA must have been the cue for three identified Duke students. I'll bet the first results showed it but WOULDN'T clarify the results because the proper data base wasn't made available. Clever!!
Where did you read that? I thought there was only one.