Edward Snowden has called for a complete overhaul of US whistleblower protections after a new source from deep inside the Pentagon came forward with a startling account of how the system became a trap" for those seeking to expose wrongdoing. The account of John Crane ... appears to undermine Barack Obama, Hillary Clinton and [others] who argue that there were established routes for Snowden other than leaking to the media. Crane, a longtime assistant inspector general at the Pentagon, has accused his old office of retaliating against a major surveillance whistleblower, Thomas Drake. Not only did Pentagon officials provide Drake's name to criminal investigators, Crane told the Guardian, they destroyed documents relevant to his defence. Thomas Drake's legal ordeal ruined him financially. His case served as a prologue to Snowden's. In 2002, Drake and NSA colleagues contacted the Pentagon inspector general to blow the whistle on [a] tool, Trailblazer, for mass-data analysis. Crane, head of the office's whistleblower unit, assigned investigators. For over two years, with Drake as a major source, they ... prepared a lengthy secret report [that] eventually [helped] to kill the program. As far as Crane was concerned, the whistleblower system was working. But after an aspect of the NSA's warrantless mass surveillance leaked to the New York Times, Drake himself came under investigation and eventually indictment [for] hoarding documentation - exactly what inspector-general investigators tell their whistleblowers to do.