"Terrorists are not half intelligent."
The only terrorist I knew personally was one of the World Trade Center car bombers, while he was incarcerated at a local federal prison. He was quite intellegent and educated, far more so than the prison guards who surrounded him, who were probabally on a par with the TSA folks.
SO- It sounds like the bottom line is that it is extremly unlikely that these detector strips will prevent a bombing. How much money is being wasted on this? Why don't they stop and use the money elsewhere?