sentences:  On August 30, 1997, a U.S. Customs Agent at a border crossing from Mexico pulled a passenger from a bus bound for Houston, Texas, suspicious of his responses to her questions.Upon further investigation the agent found the identification offered by the passenger to be a known alias for Johnson, and he was arrested when multiple passports were found in his possession.Independent of Johnson's apprehension, investigators were already following a trail of clues that led to the North Carolina storage shed on September 18, 1997.