Back in 1995, Mark Graf, a security specialist at the Rocky Flats nuclear facility outside Denver, became alarmed about the temporary removal of 450 kilograms of plutonium oxide from a vault-like room to a "soft room" protected by drywall that you could punch a hole through. Graf eventually had to take his concerns to the media before the plutonium was stored once again in a safe location. Graf was a whistleblower.