I wasn´t aware of this witness :
"A former Huffman manager told investigative journalist Daniel Hopsicker that a carload of FBI agents pulled up outside his house in the middle of the day, on the day of the attack.
"They were outside my house four hours after the attack," he says in Welcome to Terrorland. Hopsicker writes that "they didn't strong-arm him to make him think harder and cough up some useful leads, but to ensure he kept his mouth shut."
(...)
What did he know?
These guys
were double agents.... I gleaned early on that the operation I was working for had government protection. They were let into this country. How did the FBI get here so soon? Ask yourself: How'd they get here so soon?"
http://rigorousintuition.blogspot.com/2005/06/sound-of-one-hand-slapping.html
( "Atta was already a pilot.(So why flight school?) The best answer may be a familiar one to students of deep politics: trafficking narcotics. ) Same link.