Please see my previous comment. Here's the part to pay attention to:
> The FISA Court that is supposed to provide critical oversight of the U.S. government's vast spying programs has limited ability to do so and it must trust the government to report when it improperly spies on Americans.
The courts are too busy and are leaving it up to the people doing the crimes to police themselves and report their crimes to the courts, on a "trust" based system.
Nobody is watching the watchers, that's why.