NBC News has obtained the complete file on the investigation – the police report and assessments by two psychologists who interviewed the boys — which provides new details about Sandusky’s behavior. It also could raise fresh questions about how school and local authorities handled his case.

“There was very little doubt in my mind (Sandusky) … was a male predator, someone that was in the process of grooming a young man for abuse ,” said Chambers, speaking publicly for the first time, with the permission of her client’s family, in an interview with NBC News. “I thought…my report was strong enough to suggest that this was somebody who should be watched.”

Chambers’ detailed report is potentially significant because it was the first clear warning about the former Penn State coach’s actions – nearly four years before a then-graduate assistant, Mike McQueary, reported to the late Coach Joe Paterno and other top school officials that he had found Sandusky in the Penn State showers one evening with another young boy, engaged in what he viewed as sexual contact.