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Security Clearance Careers Podcast

The Polygraph Files: Myths, Mishaps, and Must-Knows

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Myth vs. Reality: What You Need to Know About Polygraphs


Myth 1: Polygraphs Are 100% Accurate and Always Determine Truth

Reality: Polygraphs are not “lie detectors.” They measure physiological responses such as heart rate, blood pressure, and sweat gland activity—signals that may indicate stress or anxiety. Trained examiners interpret these results, but several factors can influence the outcome:

  • False positives and false negatives happen.
  • Anxiety, medical conditions, or medications can affect readings.
  • Polygraphs are investigative tools, not final proof of truthfulness.
  • In the clearance process, a failed or inconclusive test often just means further review or a retest.


Myth 2: Failing a Polygraph Automatically Disqualifies You from Clearance

Reality: A polygraph is only one piece of the broader adjudication puzzle. Even if you “fail” a test, you may still move forward in the process. The full review includes:

  • Background checks
  • Interviews
  • SF-86 form review
  • Corroborating evidence from multiple sources

Many applicants are given another chance to take the polygraph or explain their answers before any decision is made.


Myth 3: You Can Beat the Polygraph with Tricks or Techniques

Reality: The internet is full of “tips” for beating the polygraph. Examiners are well aware of these tactics, and attempting them can:

  • Raise red flags and trigger suspicion
  • Lead to invalidated results
  • Damage your credibility more than a poor showing on the test itself


Trying to game the polygraph can backfire badly—often worse than just answering honestly.


Polygraphs can be stressful, but they’re not the final word in your clearance journey. The most important thing you can bring into the exam is honesty—both with the examiner and yourself. Understanding how polygraphs work, and knowing that a single test doesn’t determine your fate, can go a long way toward reducing the anxiety that comes with this infamous step in the process.

If you’re heading into a polygraph soon, take a deep breath, skip the internet “hacks,” and focus on telling the truth. The rest is just part of the process.

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