A 2008 survey by The Barna Group asked adults which, if any, of eight behaviors with moral overtones they had engaged in during the past week. The behaviors included looking at pornography, using profanity, gambling, gossiping, engaging in sexual intercourse with someone to whom they were not married, retaliating against someone, getting drunk, and lying. Of those surveyed:

• Twenty-eight percent had used profanity.
  
  

In 2004 Bella DePaulo, a visiting professor at the University of California, Santa Barbara, who specializes in studying forms of human deception, asked college students and members of the community-at-large to keep a notebook to tally up the number of lies they told in one week. By the end of the experiment, DePaulo found that the students had lied at least once to 38 percent of the people they came ...