3 Best Private Investigation Service in St Louis, MO

Expert-recommended Top 3 Private Investigation Service in St Louis, Missouri. All of our private investigators actually face a rigorous 50-Point Inspection, which includes customer reviews, history, complaints, ratings, satisfaction, trust, cost and general excellence. You deserve only the best!

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STL DETECTIVES

St Louis & Surrounding Areas,
St Louis, MO 63101

Since 1994

Specialty:

Domestic Surveillance Business Surveillance Forensic Investigation Child Custody Missing Persons Personal Background Checks Alcohol/Drug Abuse Child Abduction Harassment Home Security Petty Theft Employee Theft Misconduct Absenteeism and Fraud Child Support

"STL Detectives provides professional private investigative services to law firms, insurance companies, major corporations, small businesses, and private citizens. Their investigators are fully licensed and insured. They also participate in continuing education training on a quarterly basis. Their investigators have been seasoned by years of conducting all types of investigations and are thus more than adequately equipped to handle all facets of investigative work and security. Their team has a solid track record in corporate surveillance, with numerous white and blue-collar crimes having been solved and under their belt. They assure you that regardless of the type of investigative work you need completed, you will find them to be professional, knowledgeable, and skilled. The STL Detectives team has the experience, discretion, and training needed to implement the specialized detective services required to meet your needs. The firm also serves St Charles.

2026 Update: For each case they pursue, they rely on the most current, sophisticated investigative techniques and technologies."

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Contact:

(636) 734-2957

Open 24 Hours

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Gateway Investigations, LLC - St Louis, MO Private Investigation Service
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GATEWAY INVESTIGATIONS, LLC

10825 Watson Road, Suite 100, Sunset Hills,
St Louis, MO 63127 Directions

Since 2008

Specialty:

Workmen's Compensation Surveillance Infidelity Surveillance Divorce / Child Custody Surveillance Family Surveillance Employee Theft and Covert Surveillance Job Site and GPS Tracking Surveillance Workplace Accident Investigations Background Checks / Locates Subrogation Investigations AOE/COE Investigations (arising out Of Employment / Course of Employment) Accident Site Inspections Life Insurance Investigations Auto Accident Investigations Witness Interview / Canvass Investigations Disability Fraud Personal Injury

"Gateway Investigations, LLC serves individuals, law firms, self-insured companies, and large-scale insurance companies. They specialize in complete insurance investigation services for a variety of types of cases, including workers’ compensation, disability, automobile, and personal injury claims. They provide surveillance and GPS tracking services to give you the peace of mind you deserve in matters of the heart. They have conducted over 700 workplace accident and reconstruction investigations in the last six years. They can provide surveillance services, background investigations, witness interviewing, and more to help major insurance companies discover fraudulent claims. Gateway Investigations, LLC offers 24/7 free situational evaluation.

2026 Update: For the last seven years, Gateway Investigations has provided fraud investigators for over 2,000 insurance cases in the St. Louis area."

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License #2010032777

Price:

Surveillance Services (Per Hour) $100
Lodging Per Day $125
GPS Tracking With (24 Hour) On-Call Surveillance
Installation Fee $75
Activation Fee $45
Investigative & Attorney Services (Per Hour) $100

Contact:

(314) 238-1367 (314) 766-0351

Mon-Sun: 5am - 2pm

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3+ YEARS IN TBR
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A-1 PRIVATE INVESTIGATIONS, LLC

9207 Manchester Road,
St Louis, MO 63144 Directions

Since 2001

Specialty:

Background Checks Counseling Divorce and Support Insurance Fraud Investigations Accident Reconstruction Fire and Arson Investigations Internal Thefts Notary Process and Security Services Bank Deliveries Special Events Security Investigations Witness Interviewing Investigations

"A-1 Private Investigations, LLC offers a diverse range of specialized investigation services. Their expertise spans from locating missing individuals to conducting comprehensive surveillance operations. Spearman is the founder of the firm. He has investigated more than 300 cases in the first decade of operation. He has a current secret security clearance with the Department of Defense and is highly proficient in both management and protection services. As the President of A-1 Private Investigations, Roger Spearman brings a wealth of experience as a retired Police Lieutenant from the University City Police Department in University City, Missouri, where he dedicated 30 years of service. Their expert staff combined with state-of-the-art technology enables them to provide totally discreet, complete, and timely customized packages to meet your investigative needs. Their team of versatile investigation specialists is ready to support you in enhancing your firm's security in any manner necessary. Their investigative agency is currently licensed to operate in Missouri, Illinois, Indiana, Kansas, Nebraska, Michigan, Tennessee, and Texas.

2026 Update: A-1 Private Investigations, LLC is currently members of Airport Minority Advisory Council, American Society of Industrial Security, American Subcontractors Association, Associated General Contractors of America, etc.,"

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License #LC0047741

Contact:

(314) 726-1717 (800) 517-2174

Mon-Thu: 9am - 4pm
Fri: 9am - 12pm
Sat & Sun: Closed

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