Why did Atta have to check two of his bags ?
Weighing this with the information about Atta 's actual activities , the negligible information available about Atta to other U.S. government agencies and the German government before 9/11 , and the interviewer 's assessment of the interviewee 's knowledge and credibility , the Commission staff concluded that the officer 's account was not sufficiently reliable to warrant revision of the report or further investigation .