Christopher Hitchens doesn't think much of the Ashcroft DOJ's handling of the Moussaoui arrest either, let alone what it has "learned" from its mistakes:

Here is how the official police-mentality syllogism currently runs. Before September 11 we asked for infinite antiterrorism budgets and spouted continuous national security rhetoric. Meanwhile, we rolled ecstatically in the same bed as the Saudi and Pakistani secret police forces, which were the paymasters and armorers of the Taliban and Al Qaeda. As a direct result, a group of spoiled Saudi sadists and fanatics were able to rehearse the subversion of American civil aviation. They were then able to carry it out. Frantic calls from flight schools to the FBI, warning of odd characters using the jumbo-jet simulator, were coldly ignored. Several such characters, whose names were actually on the terrorist watch list, were able to buy their own airline tickets on September 11 without even using a false ID. Quite obviously, these facts allow only one conclusion. From now on, FBI agents should have untrammeled power over all civilians living in the United States, and all their private movements and communications.