er... they have to start somewhere? it's not meant to be fool proof. just better than reading all of them. do you, when you browse the web, look at every single document, following every link, until you get one that is relevant? no, you go to google, put in some keywords, and look at those results. Do you get wrong pages? Same thing. I don't think the government should be reading our emails without a warrant or anything, I'm just saying, logistically speaking, there is nothing wrong with producing false positives, there are many ways to weed them out, even before 'reading' them. there is always the possibility they'd get false positives even just picking emails at random to read too, so I don't see what your issue is... if the moral implication of searching people's email is what you're upset about, then complain about that. But if you're already past that point, and you're going to search them, keywords are a good start. I don't see how that's anything but self-evident.