• Your Trusted Private Investigators in Williamson County Illinois

    Since 1996, Advanced Investigative Services, Inc has been providing the most comprehensive investigative services in Williamson County, Illinois. Advanced Investigative Services, Inc prides itself on its reputation and can provide references from our many satisfied clients, including manufacturers, law firms, and corporate managers, helping them with:

    • Attorney Services
    • Consulting
    • Workers' Compensation
    • Video Surveillance
    • Undercover Operations
    • Pre-Employment Screening
    • Background Checks
    • Insurance Fraud
    • Embezzlement/Theft
    • Asset Recovery/Searches
    • Process Service
    • Pre-Marital Background
    • Covert and Overt Camera Installation
    • Missing Persons
    • Interviews/Statements
    • Product Liability
    • Pre-Trial Investigations
    • Crime Scene Investigations
    • Stalking
  • One reason that Advanced Investigative Services, Inc is the best in the investigative industry is that we only hire the most experienced private investigators. The founder of Advanced Investigative Services, Inc, William R. Barrett, is a retired Illinois State Police Captain with over 41 years of experience in every type of investigation. In fact, many of our expert investigators come from or currently work in local, state, or federal law enforcement. Our team has the knowledge and resources available to them to conduct the most thorough investigations using their vast contacts in law enforcement. Membership in prestigious investigation organizations also allows our private investigators to access information via a secure web-based information sharing database.

  • Private Investigators in Williamson County Illinois

    If your company needs background or pre-employment screenings, you can count on us to get the information you need to make informed hiring decisions. Unfortunately, many businesses experience workplace theft or fraud. Advanced Investigative Services, Inc can quickly investigate these matters and give you the information you need to verify fraud, theft, or any other type of criminal activity. We also work closely with law enforcement agencies, and many of our investigations have resulted in arrests and criminal prosecutions. At Advanced Investigative Services, Inc, we have access to experts in every investigative field including:

    • Video/Still Photography
    • Licensed Pilots
    • Licensed Investigators
    • Surveillance Technician
    • Accident Reconstructionist
    • Criminal Defense Detectives
    • Covert/Overt Corporate Investigators
    • Polygraph Examiner
    • Audit/Fraud Expert
    • Executive Protection Experts
  • Advanced Investigative Services, Inc also provides personal and civil investigations to individuals. Many divorces require investigative services such as asset searches or surveillance, and Advanced Investigative Services, Inc can complete these investigations quickly and confidentially. Let us help you locate a missing person, conduct background checks on acquaintances, or provide pre-marital background investigations. No matter what type of investigative services you or your business needs, Advanced Investigative Services, Inc can provide it at an affordable rate based on the scope and complexity of your individual case.

  • Executive Protection Services

    • Experienced and professional team
    • Surveillance operations and surveillance detection
    • Our Lead Protection Specialist has over 20 years of experience as a law enforcement officer
      • Currently, a special agent for the United States military, specializing in Protective Services
      • Extensive experience in undercover operations, surveillance, and criminal investigations
      • Protection experience with high-level executives and government officials
    • Our team’s training consists of:
      • Firearms
      • Defensive tactics
      • Surveillance
      • Driving tactics
      • Completed an elite training school in personal protection
  • Contact Your Local Private Investigator in Williamson County Illinois

    Are you looking for a professional private investigator on behalf of your business or for a personal investigation? Advanced Investigative Services, Inc has been the leader in investigative services in Williamson County, Illinois since 1996. We have a team of professional and experienced investigators with the right skills to handle any type of investigation. Whether you are in search of a missing person, want to run background checks on potential employees, or need video surveillance, Advanced Investigative Services, Inc has the professionals for the job.