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Should I Take a Lie Detector

Lie Detector Tests People facing criminal charges sometimes worry they’ll be asked to take a polygraph or “lie detector,” not realizing they are outdated, unreliable, and ordinarily inadmissible evidence in a court of law.


“Frankly, lie detectors are much more common in courtroom dramas on TV than in real-live criminal court.”

– Bill Powers, Charlotte Criminal Defense Lawyer

“Lie Detector Tests” in North Carolina

Our advice to clients, whether it pertains to giving a statement, going into the station to “clear things up and answer some questions,” or submitting to polygraph testing is this:

Politely decline to cooperate and seek legal advice immediately.

Take the 5th and Lawyer Up.

What is a Lie Detector Test?

Polygraphs, by their very name (poly = many / graph = tracings or recordings of data), measure several sources of information and record it on a graph.

“Lie detectors” measure things like:

  1. Heart Rate
  2. Blood Pressure
  3. Respiration Rates
  4. Skin Conductivity
    1. Galvanic Skin Response
    2. Electrodermal Response

Psychologists agree there is little evidence to indicate polygraph tests and polygraph testing can accurately tell whether someone is telling the truth or a lie.

Indeed, the term “lie detector” itself is a misstatement of sorts.

A “polygraph examiner” interprets physiological responses to a series of questions.

Increased heart rate, breathing, and changes electrical resistance of the skin, in response to a question and/or due to emotional stress, have consistently been disproven as indicators of honesty.

“Some people think it’s as simple as asking a question and a red light goes off, showing you’re not telling the truth. Fortunately, lie detectors are rapidly going the way of the Dodo Bird.”

– Bill Powers

The irony is, to say a “galvanometer” (a “lie detector”) is scientifically accurate, and therefore reliable as evidence of any crime or mens rea, is itself not telling the truth.

Are Lie Detector Tests Admissible in Court? Is a Lie Detector Admissible Evidence in North Carolina?

No. The North Carolina Supreme Court in 1983 found lie detector tests to be scientifically unreliable and therefore inadmissible as evidence at trial.

It’s up the Finder of Fact to determine, using life experience and weighing the evidence at trial, guilt or innocence.

No machine can take away that fundamental protection of the Constitution.

It doesn’t matter whether the criminal charges are felony vs misdemeanor offenses.

The results of a lie detector or polygraph testing are not admissible in North Carolina.

The Supreme Court in North Carolina v. Grier states in part:

Even a cursory examination of the cases and journals discussing this subject reveals a significant division of opinion regarding the effectiveness of the polygraph as a means of detecting deception

One would be remiss in failing to note, prohibition of lie detector evidence is not limited to the prosecution of criminal charges in North Carolina.

Lie detector tests have been excluded as evidence when sought to be introduced by the defendant:

We have previously held ‘that in North Carolina, polygraph evidence is no longer admissible in any trial.’ State v. Grier, 300 S.E.2d 351,; see also State v. Jones, 466 S.E.2d 696 cert. denied, 518 U.S. 1010, (1996); State v. Mitchell, 403 S.E.2d 287, 291 (1991).

Should I Agree to Take a Lie Detector Test?

While most everyone in the court system knows and understands lie detectors are not admissible evidence, occasionally police officers threaten a lie detector to see if the accused will give a statement.

Police officers, to some extent, are allowed to bluff.

“I’ve been a practicing Charlotte criminal defense lawyer since 1992. I cannot remember the last time we saw a police officer try to get a lie detector test. At the same time, I have heard of instances where is has been threatened to get consent to search.”

– Bill Powers, Criminal Defense Attorney

Will the Charges be Dismissed if I Pass a Lie Detector Test?

This again is an area of great confusion if not consternation.

Lie Detector Test While not admissible at trial, there are instances when positive performance on a lie detector has been used to negotiate a plea and even a dismissal of charges.

Again, that has become increasingly infrequent, as the “art” of conducting and interpreting polygraph testing is largely lost to generations past.

Put simply, it’s difficult at best to find a well-qualified polygraph examiner.

In our experience, most people familiar with lie detector testing have aged-out and retired.

Topics of Interest – Legal Information
  1. Should I talk to the police?
  2. Can an attorney visit the jail?
  3. What does Indicted mean?
  4. What are bond hearings for?
  5. Probable Cause Hearings in North Carolina
  6. Taking the Fifth – Miranda Rights
  7. The Truth About Lie Detector Tests – APA
Charlotte Criminal Defense Lawyers

Facing criminal charges, or even just an allegation of criminal wrongdoing, can be a scary, difficult time in your life.

“We firmly believe it’s a good idea to retain the services a Charlotte criminal defense attorney early-on in the process. We can help explain your legal rights and guide you through what has become an increasingly complex system.”

– Bill Powers

Legal consultations with our team of Charlotte criminal defense attorneys are free of charge. Everything discussed during consultation and legal representation at our law firm is strictly confidential.

Call our Charlotte lawyers now: 704-342-4357

You may also email Bill Powers directly at: Bill@CarolinaAttorneys.com

Client Reviews
★★★★★
I am so fortunate to have had Bill Powers on my case. Upon our first meeting, Bill insisted that through the emotions of anger, sadness, confusion, and betrayal that I remain resilient. He was available to answer questions with researched, logical, truthful answers throughout our two year stretch together. I went to any lengths for my case because he won my trust almost immediately... J.R.
★★★★★
My daughter had a second DUI and when it all seemed hopeless, Bill was able to get the charges dropped. This is a man who is extremely knowledgeable, yet still keeps his integrity which was impressive to me. He handles himself with dignity. If you hire him, you will have the best of the best, along with his expansive intellect and wisdom about the law. Lisa
★★★★★
Bill Powers’ staff has handled several traffic citations for me over the years, and they exceeded my expectations each and every time. Would highly recommend anyone faced with a traffic citation or court case contact his office and they will handle it from there. M.C.
★★★★★
Bill and his staff are flat out great. I (unfortunately) was a repeat customer after a string of tickets. These guys not only took care of the initial ticket for me, but went the extra mile and reduced my problems from 3 to just 1 (very minor one) on the same day I called back! I would recommend them to anyone. A.R.