St. Louis Missouri region (636) 391-2188
Chicago Illinois region (312) 229-0074



  • Private Investigators
  • Polygraph / Lie Detector Examinations
  • Eavesdropping Detection
  • Protective Services & Emergency Preparedness


A Recognized Industry Leader


20 years of serviceMid-West Protective Service, Inc. ® is recognized as an industry leader and we provide unmatched services. We provide statewide coverage in Missouri and Illinois, with offices in St Louis and Chicago. Some services are available nationally and internationally. Our staff consists of Private Investigators, Surveillance Agents, Polygraph Examiners, Protective Service Agents, and Forensic Examiners. We are a licensed, full service, fully staffed, professional agency.We base our success on hard work, integrity, and our main focus -client satisfaction. Our goal is to provide our clients the winning edge! We provide services to individuals, attorneys, insurance companies, corporations, financial institutions and government.


Your Complete Resource


Mid-West Protective Service, Inc. ® was established 1993. Our goal has always been to provide clients one resource to address their many needs or problem(s). Clients often need varied services to include; private investigations, background investigations, polygraph examinations, threat / risk assessments, research, surveillance, protective services, etc. To provide the highest quality of service, we are staffed with many highly trained, experienced, and educated investigators / agents to meet the many demands that our clients have. We pride ourselves on having the capability, experience, and knowledge to help our clients with almost any need, problem or situation.

 Tips - Hiring Private Investigators


When potential clients contact us regarding the hiring of private investigators, most people have many questions as they are unfamiliar with the process. To assist potential clients, we have compiled some basic information that will provide insight on the process of hiring private investigators.>> Read More


St. Louis Missouri region:  (636) 391-2188

Chicago Illinois region:  (312) 229-0074




Mid-West Protective Service, Inc.® is a Registered Service Mark with the United States Patent and Trademark Office, Reg.No. 2,643,021. Mid-West Protective Service, Inc.® company name and logo are Registered Service Marks with the States of Missouri and Illinois.

Polygraph Examinations & Lie Detector Testing

We can help you seek the truth! Our professional polygraph examiners can assist you with the truth verification process.

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Private Investigators & Private Detectives

Professional investigative services are available to assist with all your investigative needs. When you need the truth - We provide the facts !™

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Bug Sweeps & Eavesdropping Countermeasures

Concerned about information loss? Don't be a victim - we can assist in securing your communications.

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Protective Services & Emergency Preparedness

We provide protective services to individuals, corporations, schools, celebrities & dignitaries. Services available nationally & internationally.

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License Info

Missouri License:

  • 2010008268

Illinois Licenses:

  • 117-001006
  • 122-000946
  • 118-000274
  • 123-000342

Kansas License:

  • A-895

Arkansas License:

  • CMPY.0000966