[Ghoulish Delight]

I think if something's viewable on the screen in a public place, privacy isn't an issue. If it were a matter of them, without warrant, going in and looking at the history on the computer, that'd be one thing, but in general there is no way to turn a computer monitor at a library where it's not visible to someone else in the public space from some angle. He may have had it turned so that when he was talking to her, she couldn't see it, but the article doesn't seem to say that she had to do anything extraordinary beyond move to another angle to be able to see it.

And agree with the law or not, it is a crime to view child pornography. And a library employee who has reasonable suspicion of a crime should (and should be allowed to) report it.