About Us

Joe Mar Investigations

Welcome to Joe Mar Investigations, your trusted partner in discovering truth, and serving the Greater Los Angeles area, law enforcement agencies, businesses and individuals. With over 40 years of collective experience, our team of experts  is dedicated to providing accurate and reliable testing services to meet your needs.

Our Expertise

At Joe Mar Investigations, we pride ourselves on our extensive backgrounds in law enforcement. Our lead investigator, Joe Delia, is a former Deputy in a SWAT unit, bringing a wealth of knowledge and experience to our practice. His specialized training in hostage negotiation equips our team with unique skills to handle even the most challenging situations with professionalism and care.

Our Team

Our team consists of highly trained individuals, each with years of experience in the field. We have collectively been involved in numerous high-stakes scenarios, allowing us to approach every examination with confidence and precision. Our diverse backgrounds ensure that we can cater to a wide range of clients, from law enforcement agencies to private individuals and law firms.

Our Mission

At Joe Mar Investigations, our mission is to uncover the truth while maintaining the highest standards of professionalism and integrity. We believe that transparency is essential for building trust, whether in personal relationships or professional environments.

Why Choose Us?

  • Decades of Experience: With 40 years in the industry, our expertise is unmatched, ensuring accurate and reliable results.
  • Professionalism and Discretion: We prioritize your comfort and confidentiality, creating a respectful environment for every client.
  • Media Recognition: Our commitment to excellence has led to features on various television shows, showcasing our expertise and dedication to truth verification.

At Joe Mar Investigations, we understand the importance of every detail. Let us help you find the answers you need. Contact us today to learn more about our services and how we can assist you on your journey to clarity.

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The "Joe" In "Joe Mar"

…Joe Delia is actively involved in all aspects of the company, including personally performing investigations. Unlike larger companies, providing such services at Joe Mar Investigations, each client receives the personal attention of Joe E. Delia or a member of our team of law enforcement professionals. We have the time and personnel, to make it sure that you receive the needed information to make the best decisions.

​Joe is also an expert in electronic debugging.  Trained by the DEA, Joe has performed debugging services for many corporations concerned about the security of their company activities and information.  They can all now have peace of mind that their most valuable information is being protected through the efforts of Joe E. Delia and Joe Mar Investigations.

JOE DELIA
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Investigator Backgrounds Include

Officer and Detective for Monterey Park Police Department

Deputy for SWAT unit of Los Angeles County Sheriff’s Department

Senior polygraph examiner in Lancaster, California Crime Lab

Featured on television shows including The Doctors, The Test and The Marriage Boot Camp as the lead polygraph examiner

Interview and polygraph expert for Northrup Corporation

Trained in hostage negotiation, acted as lead negotiator

Trained deputies in polygraph field (in relation to crime lab)

Lead a private security team for the residence of the Turkish Consulate and protection of foreign dignitaries

Specialized training in: Electronic Sweeps and Countermeasure; Swat Tactics; Supervisory Personnel Development; Hostage Negotiation; Administrative of Justice; Personal Protection Vehicle Course; Pursuit Driving Course

License and certified as a polygraph expert with these affiliations: American polygraph Association, California Association of Polygraph Examiners and American Association of Police Polygraphist