There is also a lot of recruiting going on in our universities and prisons. That said, I still think a certain kind of profiling would work--grandmas and 6 years old little girls are highly unlikely to be suicide bombers.
Unless somebody plants something on them. One of the would-be bombers in Britain was a woman with a six month old baby who she obviously planned to blow up along with her. Hence the new rule about not bringing disposable diapers on board without letting them be examined.
Pretty sick, but that's Muslims for you. I think if any group is automatically excluded from searching (as this woman probably expected to be, because she had a baby), that's the type of person they will use, willingly or unwillingly, to transport their explosive or other device. Remember the poor American college girl who unknowingly transported the clock-radio bomb in the Lockerbie bombing had been given the bomb by her Muslim "boyfriend" and knew nothing about it, of course.