FORT LAUDERDALE, Fla. — Defense lawyers in a major South Florida terror case want to make sure jurors never hear from witness Evan Kohlmann. The proposed government expert on al-Qaida is simply no expert, lawyers say. He has no Ph.D., no faculty position and no real-life experience in the Middle East. Plus there's the age thing. Kohlmann, who has testified five times for the government already, is just 27. He's been called the "Doogie Howser" of terrorism. One critic cracked that prosecutors have been using Kohlmann "since he was a zygote." Kohlmann has fought off such attacks before. The Fort...