What are the chances of a lie detector test being wrong?
The American Polygraph Association, which sets standards for testing, says that polygraphs are “highly accurate,” citing an accuracy rate above 90 percent when done properly.
Critics, however, say the tests are correct only 70 percent of the time..
What happens if you fail a polygraph?
Not only can a failing polygraph test cost you a job, it can also follow you around throughout your career. People who fail a polygraph are usually asked to report that fact if they reapply for law enforcement positions nationwide, and some departments can share polygraph results with other agencies in the same state.
Can an innocent person fail a polygraph test?
The first reason is that an innocent person can fail a polygraph test. … A second reason why you shouldn’t take a polygraph test unless your lawyer advises doing so, is that polygraph results are generally inadmissible in court.
Can being nervous cause you to fail a polygraph?
The answer: sort of. Dr. Saxe explains: “The fundamental problem is that there is no unique physiological response to lying. So, yes, anxiety plays a role, as do medications that affect heart rate and blood pressure.”