Private Investigators - Detectives - Polygraph  Testing - Security

Services available in Missouri & Illinois 


St Louis Missouri private investigator and private detective

Licensed - Professional - Confidential Private Investigation Services


Call For Assistance

(636) 391-2188


Mid-West Protective Service, Inc.®  was established in 1993 and is recognized as an industry leader in the private investigation industry. Our staff consists of Private Investigators / Detectives, Surveillance Agents, Polygraph / Lie Detector Examiners, and Security Agents. We are a licensed, full service, fully staffed, professional agency.  Our office is located in the in the St. Louis, Missouri area. We provide services throughout Missouri and Illinois.  Contact our Private Investigators / Detectives today.


Your Complete Resource For Private Investigations & Security 


Mid-West Protective Service, Inc.®. 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 / lie detector examinations, threat / risk assessments, research, surveillance, consulting security, bodyguards, protective services, etc. To provide the highest quality of service, we are staffed with many highly trained, experienced, and educated investigators and security 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.  We provide services to individuals, attorneys, corporations, businesses, insurance companies, and government.


Private Investigators & Private Detectives

Polygraph Examinations & Lie Detector Testing

Security, Bodyguards & Protective Services

Bug Sweeps & Eavesdropping Countermeasures



 Tips - Hiring Private Investigators


When potential clients contact us regarding the hiring of Private Investigators / Detectives, 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


(636) 391-2188





polygraph exams lie detector test st louis missouri 


Insurance Investigations

Attorney Investigations & Support

Individual & Personal Investigations

Corporate & Business Investigations

Background Investigations

Cold Case Investigations


Missouri State Investigators Association



Mid-West Protective Service, Inc.® is a Registered Service Mark with the United States Patent and Trademark Office, Reg.No. 2,643,021. 

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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polygraph-exams-lie detector-test-st-louis-missouri-chicago-illinois

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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Security, Bodyguards & Protective Services

We provide security & protective services to individuals, corporations / businesses, schools, celebrities & dignitaries. Some services are available nationally.

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License Info

Missouri License:

  • 2010008268

Illinois Licenses:

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