Via Avedon, an interesting take on the state secrets privilege that comes with a terrific Jack Bauer scenario. I'm just going to give you the closing graf.
The point is this: You state the principle and you live by it. And when the nearly unique exceptions pop up you trust that a well-informed citizenry will understand and make allowances as needed. We have almost no secrets that require an SSP. Overturn it. We’ll be sensible about it if someone asserts it in a true national security emergency.
Read the rest for yourself at the link.