By David Tarrant
Dallas Morning News
Both Hosam "Sam" Smadi and Maj. Nidal Malik Hasan attracted attention from federal agents long before their high-profile arrests.
But the two Texas cases, just six weeks apart, resulted in spectacularly different outcomes - one in the prevention of a large-scale terrorist attack in Dallas, the other in a deadly shooting rampage of soldiers and civilians at Fort Hood.
The 'lone wolf' problem poses security challenges for feds