Colorado Special Investigations initiates every relationship or Domestic infidelity Investigation case using state-of-the-art video and/or digital pictures with audio recording devices to determine if your significant other is being unfaithful. We provide a wide range of surveillance services for a number of situations including verification or confirmation of cheating. Did you know state legislatures made adultery in the State of Colorado a crime? But, it is not punishable under the statutes so it is not possible for law enforcement to investigate these matters.

Colorado Special Investigations investigators initiate every workman’s comp surveillance case in Colorado using video with audio recording devices to verify disability claims. Our Colorado Private Investigators perform surveillance operations on workman’s compensation investigations’ focusing inconspicuously on video-taping a Claimants verification of a disability claim.

Colorado Process Servers serve legal documents in Denver, Aurora, Colorado Springs, Castle Rock, Parker, Pueblo, Glenwood Springs, Englewood, Littleton, Vail Avon, Breckenridge, Fairplay, Keystone, Silverthorne, Boulder, Ft. Collins, Greeley, and Aspen, Colorado.

We perform extensive background investigation checks on individuals, businesses and business owners. Utilizing our vast nationwide and international network we can find out what you need to know in a fairly short period of time. Our primary background investigator is a former law enforcement background investigator with a Colorado law enforcement agency.

Highlights, Specialties & Features

  • 2009 Winner of a Gold Star Certificate from the Denver/Boulder BBB

Professional Associations & Certifications

  • Denver/Boulder Better Business Bureau
  • BBB of Southern Colorado
  • Colorado Criminal Defense Bar Association
  • PRRN

Serviced Areas

  • Denver Colorado, Colorado Springs Colorado, Pueblo Colorado, Aurora Colorado, Breckenridge Colorado, Vail Colorado, Avon Colorado, Silverthorne Colorado, Aspen Colorado, Glenwood Springs Colorado, Leadville Colorado, Boulder Colorado

Payment Options

  • Money Orders, Discover, Personal Checks, Credit Terms Available, Debit Cards, MasterCard, VISA

Contact Details

  Person Sean Moncalieri
  City Denver , CO
  Zip Code 80205
  Address 1006 E. 23rd Avenue
  Phone Number (303) 961-4351
  Tollfree 888-661-8882

Business Representative

Sean Moncalieri

Chief Investigator

Professional Experience

2008 to present: Colorado Special Investigations, Inc., Colorado, Private Investigations Firm, CEO-Chief Investigator (2008-Present).

2007: Colorado Technical University, CTU, Colorado Springs, CO, Criminal Justice Division Adjunct Professor/Instructor (Dean-Louis Velez).

2006 to present: National Security Investigative Service, Ltd.: d/b/a Colorado Special Investigations, Colorado Springs, CO and Sacramento, CA, Private Investigations Firm, Vice-President (2006-2008) CEO (2008-Present).

2005 to 2008: Pikes Peak Community College, PPCC, Colorado Springs, CO, BSBS Criminal Justice Adjunct Professor (Chair-Ken Morris).

2005 to 2008: Regional Law Enforcement Academy, PPCC, Colorado Springs, CO, Instructor

2001 to 2007: El Paso County Sheriff’s Office, EPSO, Patrol Division, Colorado Springs, CO, Deputy Sheriff/Detentions/Patrol/S.W.A.T. Operator-Sniper

2001: Department of Justice, Federal Bureau of Prisons, Florence, CO, United States Penitentiary (USP), Correctional Officer.

1993-2009: United States Armed Forces

- 2005-2009-Colorado Army National Guard- 188th Field Support Co., Pueblo, CO (Quartermaster Branch Officer)

- 1993-2005-United States Air Force, Colorado Air National Guard/Reserves (Security Police/International Military Police)


B.A., Criminal Justice with Honors, American Military University (Graduated September 2004).

B.S., Criminology/Sociology, Colorado State University-Pueblo (May 2002-July 2004).

A. A. S., Criminal Justice, Patrol Option, PPCC, (Graduated May 2002).

A. A. S., Criminal Justice, Investigations Management, PPCC, (Graduated May 2002).


U.S. Army Officer Candidate School Diploma

HSS International Protective Services Operator’s Course

MCTC Interview and Interrogation Course

PPCC Regional Law Enforcement Academy P.O.S.T. Academy

EPSO Academy P.O.S.T. Academy

EPSO Basic SWAT Course

EPSO Detention Officer Training Course

Crime Scene Technology Certificate

Correctional Techniques Staff Academy, Federal Law Enforcement Training Center, Glynco, GA

U.S. Customs Inspector Course

Drug Symtomology and Identification Course

Air Force Professional Military Education Leadership School

Advanced Marksmanship/Observer Course (Sniper School)

Officer Survival Course

S.F.S.T. Course 09/16/04 (Recert dates current until 06/2007)

Kustom Doppler Radar 08/13/04

Multi-Jurisdictional Counter Drug Task Force Court Testimony Training

Domestic Violence and Sexual Assault Investigations Seminar

Rave/Club Drug Awareness Seminar

First Responders Course to METH labs

Gangs/Sub-Cultures training

FBI Anti-Terrorism for Law Enforcement Training

Advanced Crime Scene Investigations Course

Conflict Organizational Management Seminar

U.S. Army Certificate Military Police Corrections Course

United States Air Force Professional Management Course

United States Air Force Airman Leadership School

Honors and awards

Colorado Army National Guard Commander’s Coin for Recognition, OCS Class 49, for leadership (2007)

Colorado Army National Guard Commander’s Coin for Recognition, OCS Class 49, for physical fitness (2007)

Colorado Army National Guard Officer Candidate School Class President (2006-2007)

Air Reserve Forces Meritorious Service Medal (2003)

Global War on Terrorism Service Ribbon (2003)

State of Colorado Mobilization Medal (2003)

PPCC Associates degree Academic Award (2002)

Armed Forces Service Medal (2001)

Bureau of Prisons Exceptional Firearms Performance Certificate (08/01)

Law Enforcement Academy Leadership Award (05/01)

Law Enforcement Academy Award for Exceptional Academic Performance (05/01)

Law Enforcement Academy Class Leader (01/01-05/01)

Joint Service Commendation Medal (2000)

Joint Service Achievement Medals (09/99), (10/99)

Air Force Achievement Medals (1995), (1998), (2001)

NATO Kosovo Medal (1999)

Kosovo Campaign Medal (1999)

NATO Certificate of Commendation (1999)

Former Yugoslavia NATO Medal (1999)

International Police Non-Commissioned Officer of the Quarter, AFSOUTH (12/99)

United States Air Force Ground Combat Skills Physical Fitness Award (1997)

Expeditionary Service Medal (08/96, 10/99)

Southwest Asian Service Medal (1995)

Airman of the Month, Kuwait (09/95)

Korea Service Defense Medal (03/95)

National Defense Service Medal (1993, 2002)

USAF Space Command Inspector General Professional Performer Award (06/95).

  • I would recommend this business
  • Reliable, Dependable

We have searched long and hard for an investigator who was professional, tenacious, and trustworthy. We used a few investigators, and while a couple were good, I was not completely satisfied with the work product. An attorney I respected and now a State Representative recommended Sean Moncalieri. We have very high standards and Colorado Special Investigations meets those standards... they give 110% to every case! The equipment they use in their personal injury cases are of the latest technology and the reports are detailed and thorough.

I hesitate to recommend Sean and Colorado Special Investigations for only one reason; I would never want to find him or his investigators working on behalf of opposing counsel. We cannot say enough about Sean Moncalieri and the people he has working for him at Colorado Special Investigations as they are the best in the business!

Value for moneyDiscounted rates for repeat business from Attorneys
Service & supportReports are very professional written
Overall ratingExcellent

  • I would recommend this business
  • Fast, Affordable, Professional

Thanks for all your help and services. You guys were able to respond within a limited amount of time...there was hardly any time to prep, but you guys were able to gather all the information within a short amount of time and was at the scene within the hour. Not only did you provide excellent services, but you also provided great support and cost was extremely reasonable. Thank you for everything you have done..and i will be sure to reference your company if anybody needs such services you provide. Again, thank you very much for all your help, everything is greatly appreciated.

Value for moneyWorked with me!!!
Service & supportThey were on it!!!
QualityGave me what I needed
Overall ratingExcellent

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