In Jim Marrs book, "Crossfire", he stated that the destination of the motorcade was changed at the last minute to the International Trade Mart, forcing it to turn 120 degrees left (against secret service rules) in front of the book depository (Lone gunman theory) or into the kill zone (conspiracy theory). The change was ordered by LBJ, who of course also ordered the only physical evidence, the Lincoln limo, melted down 3 days after the shooting. Enough to convict?, no; highly suspicious?, yes.