Big Brother v. Google Update

In an Online Media Daily article, Wendy Davis supplies some backstory: "Last August, the U.S. government subpoenaed records from Google in an effort to prove the 1998 federal Children's Online Protection Act--which forbids commercial Web sites from making pornographic material available to children--is constitutional. As a practical matter, such sites would have had to require registration or credit card verification to make sure that children weren't accessing them. In 2004, the U.S. Supreme Court said the law couldn't be enforced unless the government proved that it was the only practical way to shield minors from adult-oriented sites."* This certainly sounds like a reasonable explanation, but why go after search engine information? In other words, if this is really about porn, can't Big Brother's gurus find these sites for themselves? What kind of information are they looking to find? Or is this "inquiry" in the name of Big Wholesomeness and Goodness just a way to set a court precedent for later inquiries?

Big Brother Agent: Where were you on the night of January 22?
Poor Schlep: Uh, I dunno. Think I went to the movies...
Big Brother Agent: Dunno, eh? Well, let us refresh your memory. Our MSN information indicates that you searched for Biochemical X at precisely 9:23 pm.
Poor Schlep: Ummm, dude, that might've been my roomate...he was writing a paper...

And so on. And our hero Schlep spends weeks in some Secret Detention Compound while the government adeptly figures out that Schlep's roomate, Putz, is nothing more than a freshman chem major who is also a plagarist. Just who are the terrorists, if indeed we can all agree that such a thing as terrorism does exist at all?