Why wasn't Epstein prosecuted after the first 1996 FBI complaint?

Maria Farmer, who was employed by Epstein and sexually assaulted by him and Ghislaine Maxwell in 1996, reported the incident to the New York field office of the FBI. She has stated that the FBI took her statement but that no prosecution or formal investigation followed. The FBI’s failure to act on this early report has been cited as one of the earliest and most significant institutional failures in the Epstein case. The reasons for the FBI’s non-action in 1996 have not been officially explained. No internal records of that investigation have been made public.