From the Daily Kos. Gen. Hayden is instructing us all on the difference between reasonable and probable. Here's the setup:
GEN. HAYDEN . . . Just to be very clear -- and believe me, if there's any amendment to the Constitution that employees of the National Security Agency are familiar with, it's the Fourth. And it is a reasonableness standard in the Fourth Amendment. And so what you've raised to me -- and I'm not a lawyer, and don't want to become one -- what you've raised to me is, in terms of quoting the Fourth Amendment, is an issue of the Constitution. The constitutional standard is "reasonable." And we believe -- I am convinced that we are lawful because what it is we're doing is reasonable."
Bluster got him through the press conference, but fortunately we still have a few copies of the text of the 4th amendment around.