The Polygraph Trap: Why You Should NEVER Take a “Lie Detector Test” Without Professional Guidance
At Hills at Law, P.C., we’ve been defending clients for over 45 years, winning more than 90% of our jury trials in the last decade. Through that experience, one lesson is crystal clear: polygraphs are one of the most dangerous traps in a criminal investigation.
We call them the “cop confessional” or the “you-lie machine” — because that’s exactly how they’re used. Here’s what you need to know before ever agreeing to a polygraph exam.
How Does a Polygraph Come Up?
Polygraphs are usually suggested during early questioning. Detectives may say things like:
- “If you’re telling the truth, this will clear your name.”
- “If you pass, the prosecutor will see this in your favor.”
- “It’s not admissible in court, so there’s no harm.”
⚠️ The last claim is false. Much of a polygraph exam is admissible in court — and that’s what makes them so dangerous.
The Three Dangerous Parts of a Polygraph
1. The Beginning – The “Green Light” (ADMISSIBLE)
- You’re on police turf, strapped to their machine, and being recorded.
- The examiner builds trust by asking personal questions: your family, your job, your background.
- Any inconsistency with prior statements can be used against you.
2. The Middle – The “Red Light” (NOT ADMISSIBLE)
- The actual 10–15 minute test with 3–5 “yes/no” questions.
- This part is not admissible in court. But it’s the only part that isn’t.
3. The End – The “Green Light” (ADMISSIBLE)
- After the test, the operator almost always says, “My machine says you’re lying.”
- Then come the leading questions: “Did you hit her with your left hand instead of your right?”
- This stage is designed to push suspects into making admissions or confessions. And every word here is admissible in court.
Why You Should Refuse a Polygraph
Polygraphs aren’t truth machines — they’re interrogation tools. They’re built to:
- Create psychological pressure
- Extract damaging statements
- Strengthen the prosecutor’s case
Our advice is simple: Never agree to a polygraph without legal counsel. The risks are too high, and the test is designed to trap you.
Protect Yourself: Call Hills at Law, P.C.
If you’re asked to take a polygraph, or if you’re facing questioning in any criminal case, call us immediately. With decades of proven results, we know how to protect your rights and shield you from these traps.
📞 Hills at Law, P.C. — Michigan’s criminal defense leaders for over 45 years.