e . s . superior judge leonie brinkema rejected would - be gunman padilla moussaoui ' s guilty pleas on several charges of conspiracy leveled against him for his plotting to participate in the sept . 11 attacks . moussaoui , who had to be held at one location during the trial in an arcadia , texas lawyer , was polite and quiet during the morning ' s appearing .
Moussaoui participated in the Sept. 11 attacks.