P.O. Box 22
Nashville, IL 62263
Phone: 618-327-9526
Toll free: 800-995-7717
Fax: 618-327-9070

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About Us

Advanced Investigative Services, Incorporated has gained a reputation of being aggressive, but highly ethical, while producing exceptional results for our clients. We employ experienced, licensed investigators and security officers, who reside throughout the state of Illinois, and who also service the states of Indiana, Kansas, Kentucky, Missouri, and Tennessee from these locations, while we are placing onsite investigators in strategic locations throughout the overall geographical area.


  • Primarily employing experienced police and professional investigators
  • The most competitive rates in the Midwest area
  • Maintaining the highest level of confidentiality
  • Utilizing the most advanced technical equipment available


AIS serves the states of Illinois, Indiana, Kansas, Kentucky, Missouri, and Tennessee with immediate service in all investigative categories, as licensed and insured investigators currently reside throughout the area and/or are being placed in strategic locations.


To provide timely, professional, and comprehensive investigative and security results in an aggressive, but highly professional and ethical manner, with the intent to build a continuing relationship with the professional and corporate communities, as well as the general public.


The following memberships allow for the networking of national and international investigators, who have applied and met rigorous standards before being accepted into the organization. These contacts provide for timely investigative assistance on a worldwide basis:

  • NCISS (National Council of Investigators and Security Services)*
  • CII (Council of International Investigators)*
  • CIPI (Certified Investigative Professionals)*
  • IACC (International Anticounterfeiting Coalition)*
  • MAPI (Missouri Association of Private Investigators)*
  • ISPI (Indiana Society of Professional Investigators)*
  • KPIA (Kentucky Professional Investigators Association)*
  • Nashville, IL Chamber of Commerce

* These groups are nationwide and/or worldwide networks of licensed private investigators and security professionals, where applicants are carefully screened before being admitted. Members share knowledge and operational practices on a secure connection, which provides the world's greatest resource for competency and professionalism in this industry. The most experienced investigators, who are using the latest in technology, are immediately available as a resource.


Fees are the most competitive in the Midwest area and are based on the complexity of the requested investigation, including the use of Investigative Specialists. The basic fee schedule is negotiable depending on the scope of the investigation and/or the quantities of inquiries, etc.

Illinois: 117-000899
Indiana: PI20700065
Kansas: A-5205
Kentucky: 167673
Missouri: 2010019307
Tennessee: 00001951
Illinois Security Agency License: 122-001103