What if I am asked to participate in a Polygraph (“lie detector”) test?

Unless a criminal lawyer has specifically advised you to participate, you can, and should, politely decline to take the test. The test results, as well as the refusal to take the test, are inadmissible in court as evidence. Police tend to rely on Polygraph tests as way of getting a confession, or at least an admission that assists the prosecution, from the accused, but the results have no value as evidence.