FBI : Saudi Aramco Schools in Dhahran , Saudi Arabia ( 1980-1992 ) -- William James Vahey taught at private schools in 9 countries for 42 years . He 's one of `` the most prolific alleged predators we 've ever seen , '' agent tells KPRC . Thumb drive allegedly contained images depicting sexual assault on children . Score: 6
FBI : William James Vahey taught at private schools in 9 countries for 42 years . He 's one of `` the most prolific alleged predators we 've ever seen , '' agent tells KPRC . Thumb drive allegedly contained images depicting sexual assault on children . Score: 6