If we knew that others could detect our falsehoods it would change our behavior radically. Criminality would decrease enormously, and few would be able to escape punishment. Criminals thrive when they think they won't be caught, and many crimes go unsolved. A polished lie frequently thwarts authorities, particularly juries. Convicts often admit they got away with many felonies before they were finally tried and jailed for one in particular.
What if we couldn't ever get away with lying? An effective lie detector would change the dynamic of civilization entirely. Rather than lie we would have to be silent, or face shame and rejection. Our silence would be our only defense, and not a very good one. If your overweight spouse asked, "Look how much weight I've lost! Don't I look fabulous?", our silence would betray us.
We couldn't be completely truthful in our daily lives and survive, if we tried it all at once. But a gradually higher standard of truth-telling is our only hope for survival. The blizzard of lies we're accustomed to living through now is killing us. What are the biggest lies? Take your pick: "It would be peaceful and good to live in a border-less world"; "The trillion-dollar deficits of the U.S. and the EU are not important"; "Islam is a religion of peace"; "America's police are racist, and they're hunting and killing minorities"; "We suffer. Therefore, there is no God"; and, "The world is safer and less violent today than ever before" (according to the Obama Administration).
Fact is, we're living next to a volcano, like the citizens of Pompeii and Herculaneum in 79 A.D. Small earthquakes presaged the deadly eruption of Vesuvius then, and we see similar, alarming signs every day in the news. Nature can't destroy us today, but the actions of mindless 'progressive' and rogue nations can lay waste to us all.
The final day of Pompeii and Herculaneum.
Imagine what would happen if our advancements in hi-tech gave us a sure and certain lie detection device. Our political systems would collapse until honest individuals could be found to lead us. Business leaders, too, would be going to jail wholesale, in many cases. Our entire criminal justice system would have to be cut back dramatically. Trials and lawyers would be as outmoded as carriage horses.
Jesus spoke about the liars of his time, particularly the religious authorities,
"You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth because there is no truth in him. Whenever he speaks a lie, he speaks from his own nature, for he is a liar and the father of lies." - John 8:44