Kevin Walker, an elected constable, surrendered on those charges after the alleged incident in November.
The investigation began after a woman made a report to the Delaware County District Attorney's Office that she had been victimized by a constable who had transported her to the Delaware County Prison.
That woman told investigators that Walker was operating the van that was taking her to a preliminary hearing in Media. During that trip, the woman said, Walker made sexually suggestive remarks.
After the hearing, the woman said Walker was taking her back to prison when he allegedly asked to see her breast, adding that he could 'put the release papers into the right persons' hands.
The woman complied and then, she told the D.A.'s office, Walker allegedly felt her breast while removing her belt and handcuffs back at the prison.
Walker was charged with Institutional Sexual Assault, a felony of the third degree; Indecent Assault, a misdemeanor of the first degree (3 counts); and Official Oppression, a misdemeanor of the second degree (2 counts).
Walker was arraigned and released on 10% of $25,000 bail. A preliminary hearing was scheduled for March 30th.
After his previous arrest in December, arrest documents stated that, during a traffic stop, Walker arrested one victim who was pregnant at the time, accused her of drug possession, threw her in a jail cell and made her commit a sex act before releasing her.
Another woman says she had sex with Walker five or six times inside the station because she was afraid he would arrest her.
A third woman says after Walker responded to her home for a domestic assault, he repeatedly called her and sent her text messages.
Walker is also a former Darby Township police officer.