Question: How Does A Polygraph Know Your Lying?

Can a pathological liar pass a polygraph?

Some pathological liars are “functionally delusional,” Carroll says, meaning they actually believe their own lies and can even pass a lie detector test.

And they won’t even remember the lie they just told..

Can you fail a lie detector test if you are nervous?

“The polygraph examiner is supposed to take baseline readings and account for medical conditions like anxiety,” explains Bigley. … So, yes, anxiety plays a role, as do medications that affect heart rate and blood pressure.”

How accurate is a polygraph lie detector test?

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.

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.

What medications affect a lie detector test?

When considering the effect of drugs on the polygraph, the Federation of American Scientists reported that “the tranquilizer, meprobamate (“Miltown”), permits subjects who are being deceptive to increase their ability to avoid detection in a polygraph examination.” This drug and other anti-anxiety medications or …