quickly. the point for lyndon johnson was to get something out. they wanted to move on in life in america and and it would have created a melt down of national security, would have made the cold war tensions higher, hence, it was done fast and sometimes hastery the warren commission. doesn't mean they were wrong. >> it's interesting, phil, as you write in your book, a lot of evidence was destroyed or damaged. can you explain that and why that happened? >> well, i mean, evidence begins disappearing from government files within hours of president kennedy's death. the night after the assassination, the navy pathologist pushed the original autopsy report and all of his notes from the autopsy room into the fireplace of his home and watched it turn to ash. that's just the start. in mexico city there may have been photographs of oswalt taken by the cia and tape recordings with the soviet and cuban