Today we investigate one of the biggest medical controversies of our time: vaccines. There's little dispute about this much-- vaccines save many lives, and rarely, they injure or kill. A special federal vaccine court has paid out billions for injuries from brain damage to death. But not for the form of brain injury we call autism. Now - we have remarkable new information: a respected pro-vaccine medical expert used by the federal government to debunk the vaccine-autism link, says vaccines can cause autism after all. He claims he told that to government officials long ago, but they kept it secret.