Marshall Polygraph Services
11172 Huron Street Unit 19
Northglenn CO  80234

Call Us: 303-920-9182

...................................................................................................................................................................................................................................................

Marshall Polygraph Services has been serving the State of Colorado since 2004.  Our examiner is a retired law enforcement officer with over 20 years experience administering polygraph examinations.

Marshall Polygraph Services is dedicated to providing the highest quality work product as well as to working diligently with  clients, parole officers, probation officers, therapists and other professionals in the field.  We utilize the latest computerized polygraph instrumentation to insure the highest level of validity and reliability.  

Charles Marshall is approved as "full operating level" with the Colorado Sex Offender Management Board and is a listed provider for the State of Colorado, parole, probation and social services agencies.

We specialize in the administration of attorney testing, criminal specific and post-conviction sex offender testing.  


Flexible Hours by Appointment Only
  We are conveniently located at the corner of 
112th and Huron Streets in Northglenn Colorado

Phone:  303-920-9182
Fax:  303-920-9184
E-mail:  marshallpolygraphservices@hotmail.com
Services Offered

  • Post Conviction Sex Offender
  • Attorney Testing