The Securities and Exchange Commission, supposed to be the 'cop' of Wall Street, has been destroying evidence it has collected in investigations that were preliminary in nature, but which may have, if retained, helped rein in illegal activities that later led to fraud, financial collapse or crimes. A whistleblower has been relating the possibly illegal destruction of federal records in testimony to the Senate.

Is the SEC Covering Up Wall Street Crimes?
A whistle-blower claims that over the past two decades, the agency has destroyed records of thousands of investigations, whitewashing the files of some of the nation's worst financial criminals.
by: Matt Taibbi, Rolling Stone

Imagine a world in which a man who is repeatedly investigated for a string of serious crimes, but never prosecuted, has his slate wiped clean every time the cops fail to make a case....