It is not the intention that the airport watch team challenge any suspicious person or persons, nor that they in any way challenge, control or "police" members of the public. They have NO powers whatsoever. They are simply asked to observe and if they see anything suspicious, report their sightings to the responsible authority. Will they in their "enthusiasm" over react from time to time? Quite possibly yes. But no more than the ignorant public react to spotters around an airport (especially in paranoid USA). Will this scheme be totally effective in combatting terrorism? No, absolutely not. Nor are all the other existing farcical security measures presently in place!