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Are you looking for investigative and security services in the states of Illinois and Missouri? Advanced Investigative Services, Inc is your solution. We pride ourselves on our timely and professional service; our outstanding reputation that we have amongst our numerous clients is evidence of that.

Our investigative services reach throughout Arkansas, Illinois, Missouri, Indiana, Kansas, Kentucky, and Tennessee. We provide corporate investigative services for intellectual property, workers' compensation claims, process service, domestic investigations, criminal support services, security services, and other specialty services.
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Advanced Investigative Services, Inc has earned its reputation of being aggressive but extremely ethical, producing quality results for all our clients. Each of our employees has extensive experience as licensed investigators and security officers; we continuously place onsite investigators in strategic locations throughout the overall geographic area that we service.
Our Team
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Advanced Investigative Services, Inc was founded in 1996 by William R. Barrett, a retired Illinois State Police Captain with over 41 years of experience. In fact, our organization has been rapidly growing, becoming the premier investigative agency in the Midwest.

The way we achieved this goal is by strategically placing experienced and licensed professionals who aggressively pursue every facet of an investigation in key geographic areas we service.Currently, our staff consists of 27 licensed investigators, with the majority of them coming from investigative backgrounds across the local, state, and federal levels.
Practice Areas
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Advanced Investigative Services, Inc has found thousands of solutions for a wide array of clients for various investigative needs. Utilizing us for your investigative services means that you get to benefit from a team of private investigators who, combined, have over 100 years of experience and knowledge.
Contact
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There are various reasons you could benefit from the services of a private investigator in Nashville, Illinois. You may need evidence to ensure a satisfactory divorce resolution, protect your intellectual property rights, or run a pre-employment background check. Whatever the case, contact Advanced Investigative Services, Inc for the number one investigative services in the Midwest.
St. Clair County IL
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Businesses and individuals in St. Clair County, Illinois have depended on Advanced Investigative Services, Inc for all their investigative needs since 1996. Business owners rely on Advanced Investigative Services, Inc for pre-employment screenings, employee background checks, and even for investigating workman's compensation claims.
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