Youssef Megahed was acquitted by a jury on charges of illegal possession and transport of explosives : Megahed came to the United States from Egypt in 1998 as a legal immigrant when he was 12. His problems started two years ago when, as an engineering student at the University of South Florida, he went on a road trip with a new friend, Ahmed Mohamed. The men were pulled over on a highway, near Charleston, South Carolina, for speeding. Police say they searched their vehicle and found PVC pipe with potassium nitrate inside, along with detonator cord inside one of Mohamed's bags. The government said the materials were "low explosives." Mohamed said they were materials for homemade model rockets. Youssef Megahed claimed he did not know that the materials were in the car. A search of Mohamed's laptop computer found research concerning rockets and propellants and how to manufacture them, as well as information about Qassam rockets -- crude rockets used by terrorists in the