HOUSTON — When Bassam Khalaf raps, he's the Arabic Assassin. His unreleased CD, "Terror Alert," includes rhymes about flying a plane into a building and descriptions of himself as a "crazy, suicidal Arabic ... equipped with bombs." Until last week, Khalaf also worked as a baggage screener at George Bush Intercontinental Airport. "I've been screening your bags for the past six months, and you don't even know it," said Khalaf, who also said Thursday that he is not really a terrorist and that his rhymes are exaggerations meant to gain publicity. Andrea McCauley, a spokeswoman for the regional Transportation Security...