Daniel Mangan, M.A. -- Polygraph Consultant and Certified Examiner

Frequently Asked Questions

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Straight Answers to Common Inquiries

What are your fees?


Polygraph testing conducted in the Nashua-Manchester (NH) corridor starts at only $399 (prepaid).

Rates for a polygraph test conducted at any other location vary on a case-by-case basis. Call 603-801-5179 for details.


PAYMENT: The preferred method of payment is Paypal, a secure on-line money transfer service that enables you to use your credit card or your checking account. Half of the fee must be paid prior to the test, with the balance being paid -- by Paypal or in cash -- on the day of the test. There are no refunds for cancellations, postponements or no-shows, but a transferrable credit will be issued for a test at some future date.


Why are your fees lower than those of other polygraph examiners?
Polygraph fees across the industry are overly inflated, in my opinion. By driving to my Amherst NH office -- only an hour from Boston -- the savings are considerable. Shop and compare!

How accurate is polygraph testing?

Polygraph testing appears to be only about 65 percent accurate, even under very favorable conditions.
The most comprehensive analysis to date, conducted by the National Academy of Sciences (an entity of the federal government), characterizes incident-specific polygraph accuracy as being "well above chance, but well below perfection." While the National Academy of Sciences could not attribute a finite number to polygraph accuracy (as expressed in percentage), a close reading of the government's report suggests that such testing is only about 65 percent accurate overall.
The polygraph industry, mainly through the American Polygraph Association (APA), claims "APA examiners are able to attain accuracy rates exceeding 90 percent." In my opinion, the APA's claim is wildly optimistic and should be viewed with extreme caution. Why? For one reason, the American Polygraph Association is a self-serving trade organization, dedicated in large part to the proliferation and commercialization of polygraph testing.
Here's the bottom line: All things considered, the best, unbiased information currently available suggests there's approximately a one-in-three chance of a false result in a specific-issue polygraph test. Don't believe otherwise. Polygraph's lack of reliability is the primary reason why it has been roundly condemned by the legal, medical and scientific communities since the 1920s.
Can a person fail a polygraph because they are too nervous?

Yes. This is called a false-positive result. A competent and ethical examiner will employ measures to minimize this possibility, but there are no guarantees such efforts will be successful.

Is it true that polygraph testing is biased against the truthful?

Yes, that is true of most polygraph techniques.

I've been accused of a crime and the police want me to take a polygraph. Should I take the test?
No! Take a polygraph test from a qualified private examiner. If the results are favorable, the complete polygraph file (including continuous video) can then be submitted to the prosecuting authority for a quality assurance review.

Is it possible to beat a polygraph test?
Yes, and agencies of the federal government of the United States, along with countless local, municipal and state law enforcement agencies, seem to agree. In my opinion, most polygraph tests can be beaten (or at least confounded to "inconclusive" status) with relative ease by any intelligent and determined test-taker who has sufficient motivation for thwarting the test. Instructions for beating the polygraph -- known as "countermeasures" -- are freely available on the Internet at www.antipolygraph.org .
Do you conduct polygraph tests in private homes? 
No. Testing in the home is not a good idea, in my opinion.

My spouse wants me to take a polygraph to prove I've been faithful. What do you think? 

First of all, a polygraph test is not "proof" of anything. The test result is merely an opinion based on statistical probabilities. Generally, so-called fidelity tests are a waste of time and money. Trust issues should be resolved with tangible proof (undercover surveillance, video, cell phone, text, or email records), or addressed in a clinical setting with the aid of a licensed, reputable therapist who specializes in relationship issues. However, I do conduct fidelity polygraphs in very select cases. An in-person consultation, before the actual test date, is usually beneficial and sometimes necessary.

Do you test minors?

No. Minors, by virtue of their age, are unable to consent to such a psychologically invasive procedure as a polygraph examination. While some polygraph examiners do test minors, it is my professional opinion that such tests are unethical.
Do you have a polygraph question?
I have the answer!
Please call me at 603-801-5179, or send email to polygraphexam@gmail.com