opened a small mosque near ft. lauderdale. in the late '90s, he worked several odd jobs including selling used cars. his family says that's how he played for courses at this small college in south florida. he even took classes to speak better english. a few years later, his english professor remembered videotaping him at one of those classes and turned over the tape to the fbi. the fbi says that professor's actions proved crucial to their investigation some six years later. on a hunch, leblanc asked agents in new york to show that video to would-be bomber zazi. >> he was able to make an identification. >> reporter: the fbi has a more detailed profile of him, in part from 9/11 mastermind mohammed.