Bush's Warrantless Eavesdropping Yields Few Suspects

Aside from being possibly illegal, it seems Bush's eavesdropping program has produced few "terrorist" related results, reportedly less than 10 instances worthy of followup out of approximatley 5,000 such occurances, which brings me to my problem. I am not opposed to preventing terrorist activity in the U.S. I'd be an idiot if I was. My problem is what does or did the government do with information obtained through these surveillance's of non terrorists? Destroy the information obtained? Or, hold it for "future considerations?" What I mean is, say the Government, while "listening" for terrorist related activity, comes across tax evaders, or just some disgruntled citizens disgusted with the way the country is being run. Or heck since this is a free country, what if they actually stumble upon other criminal activity? Sure we all want the criminals punished, but in America, where they pride themselves on their imagined freedoms, this includes a law against illegally obtained information. And that information includes that gotten through illegal wiretapping. So what do they do? Admit they obtained "proof" of criminal activity illegally or lie about it and say that everything we obtained on the "up and up"?
Well I think we know what they would do, what they have already done in this case as well as in Iraq's WMD's, FEMA's (in)actions during hurricane Katrina and others, deny, deny, DENY!!!
That is precisely why Bush and his illegal eavesdropping MUST be stopped AND prosecuted.