T.R.P. Polygraph and Investigative Services, LLC - Truth, Reliability and Professionalism
About Us
T.R.P .  Polygraph and Investigative Services, LLC,  President and Chief Polygraph Examiner is Gregory J. Kohles.  Greg retired in 2010 from the Bergen County Prosecutor's Office as a First Grade Detective, assigned to the Major Crimes, Homicide Squad and Polygraph Unit.
Greg spent 25 years in law enforcement, beginning his career with the Bogota, New Jersey, Police Department, holding the ranks of Patrolmen, Detective, and Sergeant, before transferring to the Bergen County Prosecutor's Office. 
Joining the Bergen County Prosecutor's in August of 2000, Greg began his career in the Criminal Investigation Division, and was quickly reassigned in January, 2001 to the Homicide Squad.  Greg remained in the Homicide Squad over the next 10 years, conducting and or participating in over 100 Homicide and death related investigations.  Throughout his career, Greg has participated in over a thousand investigations. 
While working for the Bergen County Prosecutor's Office, Greg conducted many high profile cases utilizing his expertise in Interview and Interrogations, garnishing many confessions, from active homicide cases, cold case homicides, aggravated sexual assaults, arsons, burglaries, thefts, stalkings, etc... 
For example in one such case, Greg was able to illicit the confession in a 25 year old cold case  homicide of a 19 year old female found murder in her Ridgefield Park, New Jersey home.  (For details click on the link below)  
Another example of Greg's interview and interrogations expertise can be noted in the confession and guilty plea in the Senseless Killing of a 15 year old Teaneck, New Jersey boy. (For details click on the links attached.)  
Other Notable Cases:
  • Lead municipal detective (Bogota P.D.) in arrest and conviction of Darwin Godoy, Angel Morlaes, Miguel Suarez and Dimpy Patel in the triple murder of Ajit Hira, Rajesh Kalsaria and Bushan Raval who were found bound and murder on October 23, 1997 in the Borough of  Bogota, NJ
  • Lead detective in arrest / conviction of Gabriel Cabrera in murder case of Agmet Wallace, murder in June 2004, in Upper West Side of Manhattan, whose body was found dumped on the Palisades Interstate Parkway in New Jersey.
  • Co-lead detective in arrest / conviction of Edward Ates in August 2006 murder of Paul Duncsak of Ramsey, N.J. Case was followed and televised on Dateline NBC
Greg is an expert in interview and interrogation and has testified in courts, as well as being the former lead instructor for the 40 hour Advanced Interview and Interrogation course taught at the Bergen County Law and Public Safety Institute.
Greg completed the Forensic Psychophysiologist Examiner Curriculum at the Northeast Counter Drug Training Center in Ft. Indian Town Gap, Pennsylvania, an (AAPP) approved school. Greg receved his training from school director, Elmer Criswell, the present Quality Control Director of the American Association of Police Polygraphists.  Greg is a member of the (AAPP) American Association of Police Polygraphist, the (APA) American Polygraph Association and the (NJP) New Jersey Polygraphist, Inc.
Greg personally conducts all exams and every exam is quality controlled for accuracy in strict confidence by a certified polygraph examiner. Greg attends annual seminars and classes regularly in order to maintain certification and his proficiency in new updates and techniques of the polygraph field. 
At  T.R.P. Polygraph and Investigative Services, LLC,  we utilize state of the art, 2010, computerized Polygraph equipment, the Limestone Polygraph Professional Suite , an ASTM compliant instrument.  By using computerized equipment we are able to provide the charts for quality control exactly as produced.
If a polygraph is not the solution you need, but a Private Investigator is what you need, Greg can assist with all your professional needs. With his extensive investigative background, Greg should be able to assist you with all your needs.  If not we will be glad to refer you to an expert in the area of your need.  
T.R.P. Polygraph and Investigative Services, LLC  is based on the belief that our customers' needs are of the utmost importance. We are dedicated and committed to meeting those needs. As a result, a high percentage of our business is from repeat customers and referrals.
We would welcome the opportunity to earn your trust and deliver you the best service in the industry.  Contact us for a Free Phone Consultation, you'll be glad you did.  Remember if your looking for the Truth, Reliability and Professionalism, you need to look no further.
Best Always,
Gregory J. Kohles
President / Certified Polygraph Examiner
Telephone Number(s): Cell 201-888-7145, Office 201-641-4449, Fax 201-641-4330
P.O. Box 198
Ridgefield Park, NJ 07660
NJ Private Detective License # 8636
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