Do you have problems with your iris-contraction muscles and other involuntary muscle reactions? Because that's what Voight-Kampff actually tested. Supposedly, autistics and sociopaths would still pass it (as long as they were otherwise 'normal' humans).
I'd assumed that the VK test in the movie relied on knowing about the specific implanted memories that replicants had.
I'd assumed that Dick just pulled it out of his Bag of Narrative Props. Tolkein he was not.
Replicants could have been implanted with any memories. And if someone was manufacturing illegal replicants why would they be using specific memories that were known ?
It was about judging emotional response and relationship to subtle physical cues.