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How to Prepare for Your Polygraph Test

This guide is meant to clarify common questions for individuals undergoing a polygraph test. There are many myths surrounding polygraphs on the internet. This will help you better understand what to expect and how to prepare.

What to do

  • Bring Identification: Your examiner will need to confirm your identity before testing begins.
  • Minimize Distractions: Leave your phone, smart watch, and other electronics in your car or ensure they are turned off or on silent. This will minimize outside distractions during the examination.
  • Stay Focused: If you are feeling overwhelmed with other tasks that day, try to set those aside to focus on the polygraph process.
  • Get Adequate Rest: Ensure you get a typical amount of sleep the night before. This will help you feel most rested.
  • Eat Normally: Have a well-balanced meal that sits well with you and will keep you alert and focused.
  • Prepare to Sit for Up to 4 Hours: Breaks will be offered if necessary. While exams don’t always take this long, it’s best to plan for a full 4 hours.
  • Maintain Your Routine: If you typically drink coffee or take medications/vitamins, continue to do so. Inform your examiner of any medications.
  • Stay Hydrated: Bring a bottled water if you feel you need to. Water may be provided, but please do not bring other food/beverages.
  • Use the Restroom Beforehand: This will help minimize distractions during the exam.
  • Be Open and Honest: Discuss anything that comes to mind during the interview process before data collection/testing starts, even if it doesn’t seem directly relevant. Withholding information or having unaddressed questions can hinder your ability to be successful.
  • Address Concerns Upfront: If you have any specific topics you’re concerned about, bring them up with your examiner prior to the test.
  • Understand the Process: Know that polygraph examiners are there to gather information, not to trick you. If you have any major concerns, discuss them with your examiner.
Person typing on a laptop with a notebook and coffee, preparing for a polygraph test
Person overwhelmed with book on head, preparing for a polygraph test

What not to do

  • Don’t Over-Research Polygraphs: While it’s natural to be curious, too much research can lead to confusion and stress about the process. There is a lot of misinformation on the internet that can negatively impact your understanding and preparation.
  • Avoid Attempting to Manipulate Results: Examiners are trained to identify countermeasures. Any attempts to manipulate the exam will be documented.
  • Don’t Discuss Your Exam with Others: Everyone’s situation is different, and comparing experiences can lead to unnecessary stress or misinformation.
  • Don’t Dwell on Past Polygraph Experiences: Each exam is unique, and previous experiences don’t impact your current test.
  • Don’t Worry About Not Understanding Every Detail: Your examiner will explain the process and guide you through the exam.
  • Try Not to Stress Excessively: Some nervousness is normal and expected by the examiner.


    Remember, the key to a successful polygraph is to be honest and open. The examiner is there to gather accurate information, not to judge you. If you have any questions or concerns, don’t hesitate to discuss them with your examiner before or during the process.