“If you have nothing to hide, take a polygraph.” It sounds reasonable. Investigators say it because it works — not because it’s true. If you’re under investigation in Arkansas and police have asked you to submit to a lie detector test, the question isn’t whether you’re innocent. It’s whether taking the test can help you. In most situations, the honest answer is no.
Here’s what Arkansas law actually says about polygraphs, why police use them, and what you should understand before agreeing to one.
The Point Almost Everyone Misses
Polygraph results are generally inadmissible in Arkansas criminal court. But statements you voluntarily make during the pre-test interview, the examination, or the post-test questioning are not protected merely because they occurred during a polygraph — if otherwise admissible, they can be used against you. A polygraph is not primarily a truth-detection device. It is an interrogation session with a machine attached.
Are Polygraph Results Admissible in Arkansas?
Generally, no. Arkansas Code § 12-12-704 provides that the results of a polygraph or similar truth-verification examination are not admissible in Arkansas courts. Section 17-39-105, part of the Polygraph Examiners Licensing Act, reinforces this by providing that the licensing act may not be construed to permit polygraph results to be introduced as evidence in a criminal proceeding.
Arkansas courts recognize an exception when the prosecution and defense enter into a written stipulation agreeing in advance that the results will be admissible. Courts scrutinize those agreements carefully, so a stipulation does not automatically guarantee admission. And the agreement cuts both ways: a defendant cannot unilaterally introduce a favorable result, and the State cannot unilaterally introduce an unfavorable one.
The practical takeaway: taking a police polygraph will almost never produce evidence you can use in your defense. Passing it doesn’t get the results in front of a jury. But the process can absolutely generate evidence the State can use.
Can You Refuse a Polygraph?
Yes. Submitting to a polygraph in a criminal investigation is voluntary. Law enforcement cannot compel you to take one, and refusing is not a crime — it isn’t obstruction, and you can’t be arrested for declining.
Your Fifth Amendment right against self-incrimination applies here as it does to any other questioning. You can decline the exam, and you can stop an exam that’s already underway. You can also decline to answer questions before, during, or after it — and you can ask for a lawyer at any point. Arkansas law separately requires that a person undergoing a psychological stress evaluation be advised of the right to remain silent, that any statement may be used against them, and of the right to counsel.
Investigators sometimes frame refusal as suspicious: “An innocent person wouldn’t have a problem with this.” That framing is a technique, not a legal principle. Arkansas appellate law generally does not permit a person’s willingness or unwillingness to take a polygraph to be introduced as evidence of consciousness of guilt. Declining a voluntary test is exercising a right, and an investigator’s frustration with that choice has no bearing on your case.
Why Police Use Polygraphs Anyway
If the results usually can’t be used in court, why do investigators keep asking? Because the polygraph isn’t really being used as a scientific instrument. It’s being used as an interrogation platform.
The Pre-Test Interview
Before the machine is ever attached, the examiner conducts an extended interview to “prepare” the questions. This is where a great deal of the useful information gets gathered — and it’s all statements you made.
The Exam Itself
The instrument measures physiological responses — breathing, heart rate, perspiration, blood pressure. It measures arousal, not honesty. Anxiety, illness, medication, fatigue, and simply being terrified all register.
The Post-Test Interrogation
This is the real objective. The examiner may tell you the test indicates deception and use that assertion as leverage to press for admissions, explanations, or changes in your story.
The sequence is the strategy. A person who walked in confident that the test would clear them is told, hours later, that the machine says they’re lying. That’s a disorienting moment, and it’s engineered to be. People in that position frequently start explaining, revising details, or “clarifying” earlier answers — and those changes become inconsistencies the State can use later.
Reliability Problems
The reason courts have been reluctant to admit polygraph evidence isn’t a technicality. It’s that the underlying reliability is genuinely contested:
- The instrument measures physiological arousal, not truthfulness. It cannot distinguish between the stress of lying and the stress of being accused of a crime you didn’t commit.
- Anxiety disorders, medical conditions, medications, sleep deprivation, and pain all affect the readings.
- Results depend heavily on the examiner’s question construction and subjective interpretation of the charts.
- Truthful people fail. It happens often enough that the phenomenon has a name — false positives — and innocent people under suspicion are exactly the population most likely to be anxious.
Defense Polygraphs Are a Different Situation
There is a meaningful distinction between a polygraph administered by law enforcement and one arranged by your own attorney. A defense-arranged exam:
- Is conducted by an examiner your attorney selects, not one working for the investigating agency
- Can often be structured through counsel so that the examination and related communications are protected by attorney-client privilege or work-product principles, rather than voluntarily disclosed to investigators
- May be useful in negotiations with a prosecutor, in seeking a stipulated exam, or in evaluating strategy internally
- Happens after your attorney understands the case — not while you’re being investigated without counsel
There are cases where a defense polygraph is a sound strategic tool. Those decisions get made with an attorney, after case review, with the mechanics arranged to protect you. That’s a completely different proposition from walking into a police station and agreeing to be examined by the people building a case against you.
A Note on Victims of Sexual Offenses
Arkansas provides a specific statutory protection worth knowing. Under Ark. Code § 12-12-106, law enforcement officers, prosecutors, and other government officials are barred from asking or requiring a victim of a sexual offense to submit to a polygraph or other truth-telling examination as a condition of proceeding with the investigation. A victim’s refusal cannot be used to prevent investigation, charging, or prosecution.
What to Do If You’re Asked to Take One
1. Don’t Answer on the Spot
You don’t have to accept or decline immediately. “I’d like to talk to a lawyer before I decide” is a complete answer, and a reasonable one.
2. Recognize What the Request Signals
Investigators generally don’t ask witnesses they’ve cleared to take polygraphs. If you’re being asked, you are likely a subject of interest — which is precisely when counsel matters most.
3. Talk to a Defense Attorney First
An attorney can find out what the investigation actually involves, communicate with investigators on your behalf, and assess whether any form of cooperation makes sense in your specific situation.
4. Remember That Declining Is Not an Admission
Exercising a constitutional right is not evidence of guilt. Investigators may express disappointment. That is not a legal consequence.
The Bottom Line
Polygraph results are generally inadmissible in Arkansas criminal proceedings absent a stipulation both sides agree to — which means passing a police polygraph usually gains you nothing you can use. What the process can produce is hours of recorded statements, an accusation that you showed deception, and pressure applied at the exact moment you’re most rattled.
If the police have asked you to take a polygraph, the more important question is why they’re asking — and what the investigation looks like from the outside. That’s a conversation to have with a defense attorney before you agree to anything.
Asked to Take a Polygraph in Arkansas?
A polygraph request usually means you’re a subject of interest, not a cleared witness. Before you agree to anything, find out what the investigation actually involves — and what you’d be walking into.
This post is provided for general informational purposes only and does not constitute legal advice. Reading this content does not create an attorney-client relationship with Wesley Rhodes, Attorney at Law. Laws and procedures change; the information above reflects Arkansas and federal law as of the date of publication. If you need legal advice about your specific situation, consult a qualified criminal defense attorney promptly.