ID could not have stopped attacks

"Charles Clarke, admitted today that his controversial plan to introduce ID cards for British residents would not have prevented the bomb attacks on London, but insisted the cards would 'help rather than hinder' anti-terrorism efforts."
Sounds more like blind faith than reasoned consideration. What would have helped -at a fration of the financial and civil liberties cost- is passive scanning of large numbers of people for explosives.
The technology exists, has been demonstrated, and could be deployed in less than two years unlike the ID card scheme which, we are now being told, might not happen until 2014 - the previous official target date was 2013.
Guardian Unlimited Politics | Special Reports | Clarke: Nothing could have stopped attacks: