North American Investigations is Long Island’s leading industry expert in the private investigation field. Based out of Mineola, NY, our firm offers a variety of private investigative services, but our Long Island branch focuses mainly on surveillance and infidelity investigations. Apparently, we’re not the only ones who believe we’re the best of the best.  So does the rest of Long Island having been recently nominated for the Best of Long Island Competition.We understand what our clients are looking for and know how to deliver the best results possible. NAI is here to bring you peace of mind.

Private Investigators for All Long Island Towns

Our LI private investigators are always serving Nassau County & Suffolk County, and are trained to handle suburban, urban, and rural investigations. All cases are performed by our most professional and experienced staff members, including retired police officers, former narcotic investigators, detectives, and licensed private investigators. We utilize a variety of private detectives (both male and female of multiple ethnicities), allowing us to adapt to any environment or situation.

North American Investigations Long Island Storefront

NAI’s Long Island private investigators are here to help assist you in your time of need. With over 45 years in business and thousands of cases solved, we are the leading industry experts here to help you obtain the evidence needed in your investigation. Headquartered in Mineola, New York, we are licensed and bonded, with a company reputation and history that surpasses our competitors. We understand New York State’s laws and regulations, and take great pride in always conducting legal and ethical investigations.

Our investigators always deliver the facts from an objective standpoint. We pride ourselves on our moral character and high ethical standards, consistently delivering the evidence to prove it. Observation and obtaining evidence is critical in our field, and all clients receive a report of our findings that is suitable for court along with video or photo documentation. Our video and photo evidence is time and date stamped, allowing you to know that you are being delivered accurate results by professionals. This supports and corroborates the investigator’s observations, which can be utilized in the court of law for any legal situation. We are able to provide court testimony and have expert witnesses available as needed.  Our private investigators on Long Island provide an array of services.  Our most popular include:

Contact an LI Private Detective Today:

By hiring LI Private Detectives at NAI, you are in safe hands with a reputable business that has an A+ rating with the BBB. From the moment you call, our primary goal is to help you find peace of mind – from the free consultation to the moment you receive our report findings. The goal of all of our investigations is to provide our clients with the truth, always being accurate, diligent, discreet, and impartial. Unlike our competitors, we are a fully staffed agency, enabling us to handle a vast array of investigative needs. Hire our private investigators by calling for a free consultation with our chief investigator.

199 Willis Avenue
Mineola, NY 11501

Free Consultation!

Call 800-724-8080 or fill out the form
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