I believe I read something about this film featuring a moment where Nathan insists that since she's innocent that they must go to the back yard to confirm how this machine works. Or something along those lines - in any case the absurdity of "I totally believe you, let me help you prove them wrong".

What I'm reminded of is that documentary The Jinx which basically takes you along for the ride until the subject accidentally confesses. Documentary filmmaking is so weird - there is always the element of fiction and make believe that somehow manages to get at the truth