WASHINGTON -- An obscure, ultra-sophisticated form of spying technology is expected to play a large role in ferreting out any suspected chemical and biological weapons in Iraq. Measurement and signatures intelligence, known in spy circles as "MASINT," identifies the production of weapons through computer analysis of infrared and radar sensors. Targets include, among other things, chemical contents of smokestack discharges from weapons factories."When this is all over and done, I think that MASINT will be very important in trying to determine where there are (weapons of mass destruction) caches," said Kenneth Pollack, a former CIA Iraq analyst who is now...