sixofnine
A few of the fbi's masters are president bush, his cabinet, govt security officials, representatives of the justice department, the federal emergency management agency, vice pres, attorney general.
Some of the agencies involved in the wtc investication: FBI, CIA, U.S. military, emergency officials and state and local governments.
Planting an arab passport a couple of blocks from the wtc would be would be very easy. Deciphering the blackbox content is the technical part. In this case, you can bet the govt has control of the technician doing the analysis.
My comparison of the govt to an organisation that takes on a life of its own, i think is a good one. In the case of the govt it is just a lot bigger. Each department must get and keep its funding, thus insuring continued existence. This applies to most of the agencies, from the biggest to the smallest. Generally they must produce results, to prove their usefulness. If you study politics in government you can see all of this. Any govt worker would likely tell you stories to this effect.
S