One of the most widely cited and uncritically questioned surveys on campus sexual assault has just unraveled.

No, it’s not yet another 1-in-5 study, which purports to show that one in five women are victims of sexual assault in college. This one claims to show that the majority of campus rapes were perpetrated by a small number of repeat offenders. The study, authored by David Lisak, was first questioned last year by Slate’s Emily Yoffe, who pointed out that the study’s respondents were not limited to college students and couldn’t be used as a representative sample of national college students.