You’ve come into possession of one vial of truth serum. Who would you give it to (with the person’s consent, of course) — and what questions would you ask?
What is truth? said jesting Pilate, and would not stay for an answer… *
Which was a smart move on his part, because starting a debate on the nature of truth is akin to starting a debate on The One True Faith: there is no definitive answer, and you’re likely to get torn apart in the process.
So stuffing someone full of nasty chemicals to make them cough up THE TRUTH is one of those exercises in futility thought up by scientists who were born, raised and continue to live in ivory towers, and thus have no idea of the human mind’s infinite variety, or its ability to delude itself.
*Francis Bacon: Of Truth