Vaniver comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 113 - Less Wrong Discussion
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Harry can test the limits of Parseltongue's truth detection properties. "I am plugged in to your Horcrux network and will not be stopped by killing me now."
He just has to say there is a reasonable chance of this, which is true, as far as anyone knows. Also, he can say there is a chance that it will trigger the magical resonance and destroy the entire network and Voldemort himself, and possibly go on to fulfill the prophecy.
Hm, Harry can't lie in Parseltongue, meaning he can't claim what he doesn't believe, but he can probably state something of unclear truth if he is sufficiently motivated to believe it.
It'd be a nice irony if part of Harry's ultimate "rationality" test involves deliberately motivated reasoning. :D