What if I fail a lie detection test?

EyeCanKnow recommends framing a failed lie detection test as one data point among many, offering an opportunity for a confession. If the individual denies wrongdoing, combine the results with other evidence. While EyeCanKnow’s accuracy is 85%-90%, no test is perfect, and false positives can occur due to factors like stress, misunderstandings, or involvement in other crimes. The key is transparency and using the results to guide the next steps fairly.

Updated on

I was recently working with a partner who asked for guidance on how to tell a client they failed a lie detection test.  Here is how we recommend telling someone they failed a lie detection test

We recommend telling clients that this is only one data point among many and this actually is an an opportunity to get a confession or to confess themselves, depending on the scenario. Using the failed test as an indication of lying, then eliciting a confession is the first step.

If the person refuses to admit wrongdoing, the next step is to combine the test results with other data, which will either strengthen or weaken the case.

Finally, it is possible an innocent person is flagged as guilty. Lie detection tests are not 100% accurate.  EyeCanKnow tests are 85%-90% accurate and polygraph can be as low as 65-85% accurate depending on the polygraph expert. By definition, some cases will be coded incorrectly.  But, other reasons an innocent person might fail include: 

  • Is a victim of or witness to a serious crime or act

  • Has committed a similar crime or act

  • Has enabled someone else or facilitated the crime or act

  • Is covering for someone involved in a crime or act

  • While testing, the person is worried about another serious crime

  • Misunderstands the test questions

  • Was intimidated by external circumstances before or during testing

  • Was intoxicated beyond an ability to understand and give answers




Latest Articles