Judges and lawyers know that – if someone intentionally destroys evidence – he's probably trying to hide his crime. American law has long recognized that destruction of evidence raises a presumption of guiltfor the person who destroyed the evidence.
So what does it mean when the US government intentionally destroyed massive amounts of evidence related to 9/11?
Judge and Prosecutor Destroy Evidence
For example, it was revealed last week that the judge overseeing the trial of surviving 9/11 suspects conspired with the prosecution to destroy evidence relevant to a key suspect's defense. And see this.
(The Defense Department has also farmed out most of the work of both prosecuting and defending the surviving 9/11 suspects to the same private company. And the heads of the military tribunal prosecuting the 9/11 suspects said that the trials must be rigged so that there are no acquittals.)
Destruction of Videotapes
The CIA videotaped the interrogation of 9/11 suspects, falsely told the 9/11 Commission that there were no videotapes or other records of the interrogations, and then illegally destroyed all of the tapes and transcripts of the interrogations.