The Student Loan Lending Industry has been under scrutiny and 11 states Attorney Generals have brought suits in the past regarding unscrupulous admissions practices, and lack of transparency from college admissions departments and evidence of corroboration with lenders to increase profits.

FORBES: Are Universities Immoral?

Rather than relying on the evidence of one person, corroboration was being sought and police were exploring bringing more "victimless prosecutions".

BBC: 'Significant' sex abuse arrests due says prosecutor

"Having regard to all the circumstances it has been concluded that, in the absence of any corroboration, the available evidence is insufficient to provide a reasonable prospect of obtaining a conviction against any individual".

BBC: No prosecution in Martin O'Hagan murder case

Unlike other forms of evidence, fingerprints don't require corroboration.

BBC: By Panorama reporter Shelley Jofre

Indeed, the Department of Justice urges that its prosecutors seek independent corroboration, either to witnesses or corroborating evidence, of a quality to assure that a guilty verdict is really well founded.

CNN: Transcript: White House Counsel Ruff's opening statement