If you're interested, there's a fun SF book called "The Truth Machine" by James L Hauperin, that deals with the same topic (apparently available for free here): http://coins.ha.com/c/content.zx?content=ttm Scientist invents perfect lie deteector. Changes society. Then the plot thickens a bit... For me, the interesting part was how business deals were struck in the new world. Buyer said "I can't pay more than X" and seller said "We can't sell cheaper than Y". Note that Y is less than X. Then, they'd negoitiate a middle price. I recommend it if you're interested. It's fairly short and reads quickly.