Apolitical Abernathy is right on profiling. What I am suggesting is El Al type measures. BTW, the El Al experts have said that we don't have a security system, just a harassment system!
1) Don't waste limited resources (time, $, manpower) on those that statistically are insignificant (tiny kids, old white people with walkers) Call me a racist, (I prefer culturist) but ALL OF THE PERPETRATORS HAVE BEEN MUSLIM MALES BETWEEN 25-45 YEARS OLD. When reality stares you in the face; don't turn away, learn from it!
2) Increased measures in the area of behaviorial profiling and interogating. This is many times more effective than simple "he be dark, he's the mark" profiling that makes the libs squirm.
3) Take aggressive action without red tape, fear of getting in trouble or getting criticized when the evidence warrants. What is the price for being occasionally wrong, inconveniencing/embarrassing the innocent? What is the price for being ineffective and lame? FT. HOOD TEXAS, PENTAGON, FLT. 93, BOTH TWIN TOWERS ON 2 OCCASIONS, in addition to the intangible cost of everyone knowing that the current US system is simply a random harrassment program, embarassing in its futility, ridiculed by its participants.