Illegal spying thoughts

I've been observing the "discussion" about the illegal spying of the Bush administration and their extreme reluctance to give details. I think I've figured it out.

My theory is that they are using a technology that "listens" to A LOT of conversations, but only takes notice when certain technical parameters, such as location of call, words in the conversation, etc., are met. In other words, it is a broad scope with a narrower focus.

Time will tell.