Lie detection is best when it's cheap to cooperate

In principle, machine learning approaches could produce lie detectors far more reliable than the polygraph. If this happens soon, it will matter a great deal: reliable lie detection could make loyalty purges much more effective, create a useful check on political and AI-lab leaders, make international treaties more robust, and make authoritarian regimes more stable.I argue the balance between these effects depends largely on cooperation cost: how much willing participation a detector needs from ...