- Private Investigators Mall
 - View PI's Web sites, shop the PI store, check out PI Magazine, or NAIS. - USARecordsSearch.com
- Offers missing person searches, background checks, public records searches, vehicle history reports, and debt collection.
- Background Check Gateway
- Enables visitors to conduct background checks using easily-accessible public records.
- Fast-Track/Cyber Masters, Inc.
- Will locate and identify people, businesses, and assets.
- Cyber-Cheaters.com
- Offers software monitoring and online decoy services are to help investigate a husband or wife's online affairs.
- Discreet Data Research
- Provider of elusive information to collection agencies, attorneys and private investigators.
- Advanced Surveillance Group
- Specialising in investigative services throughout Michigan. Offers surveillance, information gathering, background checks, infidelity investigations, locating people, and other services.
- First Advantage Corporation
- Provides information services, including single-source solutions for the screening, certification, and risk mitigation needs of corporations and consumers.
- Hallstrom Detective Agency
- Provide asset and people search services.
- Kessler International
- International corporate investigations, forensic accounting, brand protection and computer forensics.
- Creative Research, Inc.
- Specialises in background checks, pre-employment verification, and asset location.
- Investigative Resources International
- A professional investigative agency providing comprehensive service to the legal, corporate, insurance, financial and entertainment communities
- International Counterintelligence Services, Inc. (ICS)
- Provides government, business, and private clients rapid response consultations for investigations or security consulting.
- Arab Business Information
- Offers credit reports and database information.
- CounterStrike
- California-based Internet and computer network security monitoring company. Also provides investigations and intelligence and technical security countermeasure services to businesses.
- People-Finder.com
- Private investigation and people locator service.
- PDJ Services
- Specialising in reverse phone and address searches, unlisted telephone numbers, and more.
- Check Mate
- Device for acquiring proof for divorce in spouse and partner infidelity cases using semen detection.
- Pallorium
- Investigators, offices, and affiliates worldwide. Specialises in the location of missing persons.
- PInow.com
- Worldwide directory of private investigators, surveillance firms, and background check specialists.
- YourOwnPrivateEye.com
- Offers people finder, death, divorce, criminal, and marriage records, asset locator, and more.
- Orion Management International LTD
- Specialises in industrial espionage, intellectual property, and environmental investigations.
- Accetta Group
- Providing international investigations for the financial community.
- MEC Investigations Division
- Due diligence, assets searches, litigation enquiries, background research, locate individuals, discover corporate structures. international.
- Gladding & Michel, Inc.
- National and international full-service investigative agency specialising in corporate intelligence, environmental, product liability, and trial work.
- Thoroughbred Racing Protective Bureau
- National investigative agency in the horse racing industry.
- Jennings Smith
- Experienced team of professionally licensed private investigators and security consultants.
- Corpa Investigations
- Executive background reports, missing persons, asset investigations. Results or you don't pay!
- PI Resources and Locator
- Offers resources and marketing for private investigators worldwide.
- 1800WhoWhere.com
- Offers phone trace and background check services.
- Carratu International
- Investigation and fraud prevention consultancy provides blue chip clients around the world with specialist investigation services.
- Verdict Re:Sources
- Specialises in investigative research in the environmental field.
- Blue Moon Investigations
- Insurance fraud, criminal and civil backgrounds, location of people and property, arson, and accidents.
- Information Search Inc. (ISI)
- Locate missing persons, friends, witnesses, etc. We find and verify credit, assets, employment, criminal background, and more.
- Brian Brown & Associates Inc
- Consulting company specialising in private and fire investigation.
- FireTech, Inc.
- Specialise in arson and the origin and cause of a fire. Licensed in both Illinois and Indiana.
- Crown Associates
- Independent private investigators offering a range of specialist services.
- Lajoie Investigations
- Provides investigative services throughout the New England area.
- PDI Investigations, Inc.
- Provides national and international investigative services, including corporate, domestic, insurance, and criminal investigations.
- ION Incorporated
- Worldwide private investigator referral service.
- Detective.com
- Services include people locaters, background checks, investigations, surveillance, record searches and spy products.
- Eagle Investigative Services
- Services include civil, criminal, divorce, and activity checks, skip tracing, and more.
- Private Detective Online
- Offers software for genealogy information, searches, credit reports, adoption records, divorce information, and more.
- American Detectives
- International private investigation firm based in California. Services include surveillance, missing persons, and cheating spouses.
- Baxter and Associates
- Private investigation agency serving the Southeastern U.S. Primary areas of investigation are insurance, domestic, civil/criminal, employee, theft.
- HK Investigations
- Judicial judgment recovery specialists assisting creditors in the recovery of small claims judgments by seizure of assets.
- Stewart & Associates Inc.
- Licensed and insured private detective agency and security contractor providing services in Northern and Central Illinois, Southern Wisconsin, and Eastern Iowa.
- ESI International
- Provides private investigative and consulting services to the legal, financial, and business communities.
- Noesis
- Investigative consultancy firm specialising in all areas of white-collar crime and corporate due diligence, with offices in San Francisco and Los Angeles.
- AGI Companies
- Operational audits and fraud examination.
- Northern California Private Investigations
- Private investigaters representing individuals, businesses, insurance companies, and attorneys nationwide.
- All State Investigations
- Specialising in matrimonial infidelity, divorce, child custody and visitation, and alimony reduction.
- Alpha Group
- Offers private, corporate, and matrimonial or child support investigations and security, trial preparation, surveillance, and executive protection services worldwide.
- V.Y. Harper & Co.
- Licensed and insured private investigation and information resource firm with over 25 years of expertise and experience.
- Investigations Canada
- Alliance private investigation firms providing investigative and surveillance services to the corporate community.
- Rick Mangrum Investigations
- Providing surveillance and private investigation services in the Northwest United States.
- Clarence M. Kelley & Associates
- Investigative and consulting firm, founded by a former director of the FBI.
- Brewer Detective Service, Inc.
- Maintain a full staff of investigators, researchers, and skilled interviewers.
- Find Em Fast
- Report on how to find missing persons, friends or lost relatives.
- Intelex Ltd.
- An international business intelligence firm for the financial community.
- Corporate Screening Services, Inc.
- Employee and business background investigations on a national level, public record searches, and more.
- Interfor Inc.
- International firm specialising in comprehensive corporate and financial investigations for legal, corporate, financial communities, and individuals.
- Martin Investigative Services
- Full service investigative agency composed of former supervisory federal agents for corporate security, fraud cases, people searches, surveillance, and more.
- North Country Investigations
- Civil and criminal investigations for the private sector in Wisconsin and Minnesota including product liability, personal injury, and fire.
- Gambino Information Services, Inc.
- Offers background, insurance, property, missing person, and other services.
- JL & Associates
- Private investigators offering corporate, civil, criminal, and domestic investigative services.
- APC Corporate Security
- Division of Investicorp, Inc.
- Bill Greenberg Special Services
- Offers investigative services and process serving.
- International Detection Services
- Providing a professional and comprehensive investigation service to the insurance and finance industry, legal profession, and public sector.
- International Intelligence Limited
- Suppliers of specialist security services including surveillance, investigations, due dilligence, and counter espionage.
- Western Investigations
- Private investigation firm specialising in domestic surveillance, background investigations, and insurance fraud.
- Allstate Investigations
- Specialising in fugitive recovery, surveillance, background investigations, skip tracing, employee theft, and undercover operations.
- Falcon Collection and Investigations Inc.@
- Accufax Investigations Inc
- A full service investigative and security consultant firm located in Toronto Canada. We specialise in Corporate and Commercial security applications
- Filley & Associates Private Investigations
- San Francisco-based firm specialising in surveillance, and civil and criminal investigations in California, Nevada, China, Korea, and Hong Kong.
- Decision Strategies Fairfax International (DSFX)
- Provides global investigative support for businesses, law firms, and major corporations.
- T.H.R. Investigations
- Provides surveillance, insurance company claims, corporate research, and detective services.
- Bishops Services
- Background investigations and research which includes due diligence profiles, litigation support, intelligence gathering and asset searches.
- Richmond Group International
- Missing persons, employee screening, corporate investigations, and more.
- Search And Locate Unlimited Investigative Services
- Offers investigative services, information brokers, pre-employment, individual background investigations, missing persons, and more.
- Forensic Strategies and Solutions
- Services include financial, fraud, and intellectual property investigations, litigation and business intelligence, asset searches, and more.
- Crutchfield Investigators Inc.
- Private investigator. Site includes services, books, and background information.
- Galahad Protective Services
- Specialising in public figure and executive protection, threat assessments and crisis management involving stalking and workplace violence, privacy consultation, and confidential investigations.
- Blue Print Investigative Services,
- Investigation services and specialised consulting.
- USTrackers.com
- Performs people-finding and background check services. Also sells portable drug testing devices and hidden cameras.
- Safe Harbor Investigations
- Full-service private detective and security agency staffing experts in Internet and computer investigations.
- Hilton Investigations
- Provides investigative services to legal, insurance, corporate, and government agencies in Northern California.
- Alice Byrne Investigations, Inc.
- Handles a range of civil and criminal cases worldwide, including corporate, custody, malpractice and missing persons.
- Adverus
- Full-service private investigators, environmental consultants, and homeland security experts.
- Ashkelon Group, The
- Information technology detective agency offering services like email tracing, legal support services, forensic data recovery, counter surveillance, and more in the field of computer crime investigations.
- Intersec
- International security consultants.
- Morales and Associates LLC
- Specialising in the investigation and counselling of EEO discrimination complaints primarily within the federal sector.
- Automatic Global Response
- Private detective, investigation agency with local and worldwide resources.
- Berger & Berger Investigative Services
- Marine speciality investigations.
- Complete Investigations Bureau
- Private investigation firm offering services for infidelity, child custody, nursing home abuse, insurance fraud, employee surveillance, and background checks.
- Internal Intelligence International
- Offers covert and surveillance as well as a training guide and home study course.
- NY Finest Investigative Services
- Employs all former NYPD detectives to work on infidelity, criminal, and missing person cases. Also offering armed executive and celebrity protection by experienced agents.
- AP Duli Investigations
- Comprehensive solutions to meet investigative needs, security concerns, and privacy requirements generated by an information based, technologically oriented society.
- Allied Intelligence, Inc.
- Provides investigative, debugging, bodyguard, security, and security consulting services in over fifty countries worldwide.
- NEFCO Fire Investigations
- New England Fire Cause and Origin (NEFCO) fire investigating company provides services for the insurance industry in Connecticut, Massachusetts, Maine, New Hampshire, New York, Rhode Island, and Vermont.
- Roberts & Associates
- State licensed firm for criminal, civil, and domestic investigations.
- BPI Investigations
- Services include video surveillance, child custody expertise, evidence gathering, and armed personal protection.
- Roger E. Dunn Company, Inc.
- Consulting and investigation services.
- Chective
- Offers do-it-yourself infidelity testing kits.
- Blackhawk Investigations
- Private investigative agency serving California and Colorado providing pre-employment background checks, asset searches, people locates, and civil, criminal, accident and workers' compensation investigations.
- Charles Jones - PatriotNameSearch.com
- Certified searches of the list of "Specially Designated Nationals and Blocked Persons", published by the Office of Foreign Assets Control (OFAC) of the U.S. Department of Treasury.
- Investigative Logistics
- Offers private investigations, background checks, security support, executive protection, and pre-employment screening services.
- Barnett Group, The
- Offering investigative services including surveillance, litigation support, and background checks in Louisiana, Mississippi, and Tennessee.
- Bust-A-Cheater
- Offers infidelity testing kits which include a lie detector, video, see-through spray, and more.
- Policyfinder
- Helping to locate lost or misplaced life and annuity insurance policies for a low, one-time fee.
- Hawk Investigative Group
- Provides experienced private investigators, discreet executive protection, and corporate security.
- Eyes Of The World Investigations
- Specialising in insurance fraud, domestic, criminal defence, and locating people.
- Beau Dietl and Associates
- Investigative and security solutions for clients.
- CIA Investigations and Spy Gear Shop
- Sells surveillance equipment, investigative equipment and packages. Also does background checks and investigations.
- Camandago Consulting
- Camandago Consulting and Business Intelligence Services combine human intelligence with content-based research, investigation, and consulting expertise. Get details about private investigation, consulting, life coaching, and Shellee Hale's motivational blog.
- Connecticut Investigative Services
- Full service detective agency provides professional investigative services, including background and screening services, corporate loss prevention, and criminal and personal injury investigation.
- Crown Intelligence Investigations
- Private investigators based in London, offering a comprehensive nationwide and worldwide service.
- Freelance Security
- Let multiple private investigators, private detectives, and security consultants bid on your investigations and security projects.
- Intellisec
- Intellisec is an independent and privately owned company dedicated to conducting forensic investigation for over 1000 organisations in 49 countries.
- Malan Investigations
- Professional private investigative agency providing professional process service, personal protective services, skip tracing, and background checks.
- McCann Global
- Services include background investigations, due diligence, electronic device detection, fraud investigations, covert investigations, security vulnerability assessments, and more.
- National Investigators, Inc.
- Provides private investigation services to clients located throughout the United States.
- Risks Incorporated
- Offers specialist security training and consultancy services. Professional private investigators, bodyguards, and firearms training in South Florida. Associates and consultants are also located worldwide.
- Scott Frank Investigations
- Private investigator agency in Louisiana specialises in family law investigations, including child custody, divorce, infidelity and adultery, visitation interference, adoption, missing persons, process serving, and more.
- WitnessTrackers.com
- Private investigators who specialise in locating defendants and witnesses for attorneys nationwide.
- Xfor Security & Investigation Consultants
- Provides security and investigative services to both public and private sectors clients.
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