If there were a TRUTHOMETER the size of a thermometer would you want one? You could carry it with you at all times. Buy/not buy? Why?

That way there would be an independent/objective device that would measure truth. All you'd have to do is touch the person who is talking with its tip and you could instantly know if the person were speaking truth or bullsh**!  Of course some folks would try to stop the sale of such a thing. Blow up the manufacturing plant. Murder the workers. Truth is the enemy of liars. SIGH. :(