Perhaps I don't understand some dynamic here, but what prevents someone from just stating that they no longer know the pass phrase? I thought that was more or l

Perhaps I don't understand some dynamic here, but what prevents someone from just stating that they no longer know the pass phrase? I thought that was more or less a free pass, as no one can prove what you do or don't remember. Hence why the phrase "I'm sorry, I don't recall that senator" is used so often when everyone knows they're lying.