If Zacarias Moussaoui had confessed his al-Qaida membership and his terrorist plans to federal agents in the weeks before the Sept. 11, 2001, attacks, the bureau could have stepped up its investigation on multiple fronts, a former FBI agent testified. Aaron Zebley took the stand Wednesday as prosecutors neared the conclusion of the first phase of their case in Moussaoui’s death-penalty trial. He was to continue testifying on Thursday. Full Story