A search of Bradley's medical practice late last year led to the analysis of more than 13 hours of video files, computers and hard drives and more than 7,000 patient files.
Biden told ABCNews.com at the time of Bradley's arrest that "this is a very very troubling case, and we here in the state of Delaware are pursuing it aggressively to the fullest extent of the law."
"The thing that makes this case so troubling and horrific is the alleged abuse of trust in this matter," said Biden. "These are highly specialized cases where no one in the community could believe someone could do this to a child, to a child who is voiceless."
Biden said that some of the alleged victims were just months old.
According to court documents obtained by ABCNews.com, the investigation was spurred after a 2-year-old girl told her mother that Bradley had touched her genitals and "hurt her" during a Dec. 7 appointment.
According to the child's mother, who is not named in the court documents, Bradley first examined the toddler in her presence, but then "removed the victim to the basement of the office, where a toy room is located."
The mother told authorities that she permitted her daughter to be alone with Bradley "because of his position as a doctor" and because she "trusted him."
But on the way home from the doctor the mother alleges that her daughter said Bradley had sexually abused her while they were alone in the basement. The girl's father, who had taken to her to a previous appointment with Bradley, also told authorities his daughter had made a similar complaint to him in November.
In 160 pages of disturbing court documents, Bradley is accused of videotaping sexual acts with his young patients and molesting them repeatedly while their parents waited in nearby examination rooms.
Bradley, who had been in the 1,300-person town of Lewes since 1994, is accused of abusing his patients for the past 11 years.
According to the arrest documents, the examination room known as the Pinocchio Room because of its decorations was seen frequently on the video tapes obtained by authorities that reportedly show Bradley undressing his patients and performing sex acts on them.
In another room decked out with "The Little Mermaid" paraphernalia, equally horrific abuse allegedly occurred at the hands of Bradley, who investigators said was seen on the tapes muzzling screaming children as they tried to flee the abuse.
Described as a 6-foot, 225-pound man, Bradley allegedly had a "violently enraged expression on his face" as he yelled to a 2-year-old patient to perform sexual acts on him. That particular video was described by the investigating officer in court documents as "one of the most violent and brutal attacks on a child of any age" that he had ever seen.