Credibility Assessment of Maryland Polygraph Services

Contact William F. Gonnelli, Credibility Assessment of Maryland, Polygraph Services for free consulation.


William F. Gonnelli

Phone: (443) 878-3432


1213 Liberty Rd. Suite 275
Sykesville, Md 21784


Online Payment Options


On-Line Payment

For your convenience, major credit cards are accepted through secure transactions by PayPal. Please contact us to find out if your polygraph test will require a Deposit. You can also choose to pay the entire fee for a polygraph exam on-line using the PayPal option. If you wish to pay for the polygraph examination by credit card it must be done here online before your appointment. (See Refund Policy below). Only payments made by check or cash can be accepted at the time of the exam.



Unless otherwise agreed upon, polygraph examinations will be pre-paid in full and scheduled 48 hours in advance.  A deposit prepayment amount will be verbally given to the client prior to the exam.  It is the responsibility of the client to then make the requisite deposit.


Refund Policy:
If a cancellation notice is given more than 24 hours  prior to the scheduled exam, a $100 cancellation fee will be deducted from the prepayment.  If a cancellation notice is received less than 24 hours prior to the scheduled exam, only 25% of the prepayment will be refunded.

  If the examinee fails to show for his exam without notice, the client will be responsible for the full exam fee. 



Contact Information

In this area, you can enter text about your contact form. You may want to explain what happens after a visitor submits the form and include a contact phone number.

First Name:
Last Name:
Address Street 1:
Address Street 2:
Zip Code: (5 digits)
Daytime Phone:
Evening Phone: