The goal for federal agents at US ports of entry is to stop 30% of terrorists and other illegal traffic.
30%
GAO official at a recent public forum describing the 30% goal- video here
Hey VFW, Hey American Legion, Hey Joint Chiefs of Staff- what do you think about 30%?
Preventing Terrorism? More like reacting.
Just the ticket for the day "Terrorists" abandon the sneak attack (Oklahoma City, 911, USS Cole, US Marine barracks Beirut, etc.) and go with a good old fashioned shoot-out between the good guys and the bad guys.