[sanchmo]

I think they should plant some false "classified documents" into some suspected leakers hands and see where it goes.

Oooohhhhh - you're devious. I like it.
Forge several different fake documents - one for each suspect - and then see which one(s) make it out to the press.

[smith288]

New York Times - "Govt says: Nuke First, ask questions later, says CIA document"

Hey buddy? Youre on hidden camera, your under arrest for treason and espianage. Thanks! Any other potential leakers??? No?? No one wants to play anymore?

I think that would solve the problem real quick.