As of 2015, the cost of a polygraph test administered by certified examiners ranges from $200 to $2,000, depending on the length of the test, according to CostHelper. The high end of the scale includes all-day testing. Single-issue polygraph examinations take approximately two hours and cost between $200 and $800.
Some polygraph test service companies provide discounts to returning customers and for additional tests on the same issue, notes CostHelper. The American Polygraph Association offers an accredited training program and certifies examiners, called polygraphists, who complete it. Research shows that standard polygraph tests, also called lie detector tests, have an accuracy rate between 80 percent and 98 percent.