[advance_copy]

As a private citizen he can’t talk about classified matters unless the CIA (under new management) explicitly vet everything he says.

The legal prohibition on what he can reveal about CIA does not apply to testimony before Congress or any court in the U.S.

[FreeReign]

The legal prohibition on what he can reveal about CIA does not apply to testimony before Congress or any court in the U.S.

Then it would be Petraeus' obligation to tell it all at the hearing.