Private Security

Uniformed Security Officers (Armed or Unarmed)


Violence at work risk assessment


Security Officers in business suits or customized uniform attire


Special Event Coverage

Criminal and Civil Investigations

NSI Investigator Services specializes in discreet, professional and confidential investigative services. NSI also handles many cases nationally and internationally. NSI is a full-service private investigation firm. NSI conducts investigations for corporations, businesses, attorneys & individuals.

NSI Global Secured Logistics

Providing Professional Investigative and Proactive Security Services Globally


Criminal & Civil Law Investigations

Corporate Theft Investigations

Cargo Theft Investigations

Workplace Violence Investigations
Surveillance Investigations

Undercover Investigations

Asset/Financial Investigations
Insurance Fraud Investigations

Elder Abuse Investigations
Missing Persons Investigations

Provide International Escorts

Private Security

Executive Due Diligence Investigations Comprehensive Background Searches

Skip Tracing
Executive Protection
Registered Process Service
DMV Searches/Records
Real-time Vehicle Tracking

Deadbeat Parent Track-Down

Family Law Investigations

Cheating Spouse Infidelity Investigations

*Female and bilingual investigators are available.

NSI has an Operations Team Dedicated to the Puerto Rico Relief



NSI is currently the Lead Investigating Firm for a Fortune 100 Company


NSI is owned and operated by a Marine Corps Veteran and Retired Law Enforcement Investigator.


NSI is a well-established, full-service private investigation and security agency. Our services include Corporate Loss Prevention/Cargo Theft Investigations, Violence at Work Risk Assessment, Criminal and Civil Investigations, Fraud Investigations, Surveillance, Executive Protection, Missing Persons Investigations, and many more. Our goal is to provide our clients with quality services utilizing the best investigators and security teams in the nation.


We employ highly-skilled career professionals who have extensive prior experience in the US Military, Law Enforcement, SWAT, Crisis Negotiations, FBI, Secret Service, and Private Sector Investigators.


NSI Security provides professional and proactive security services for corporations, businesses, homes and private events 24 hours a day and 7 days a week. Our team is here to protect you, your business, your property and your assets.


NSI security teams can operate in any environment. The combined experience represented within our firm makes us a driving force in the Investigation and Security Industry.


NSI's Heroes 2 Work Program helps provide employment to Veterans of the US Armed Forces.


2nd Marine Division




Member of the CA Association
of Licensed Investigators

Caring of Our Children Foundation

Shelter From The Storm Foundation


Nelson Figueroa, CEO of Nelson Specialized Investigations, has more than 25 years experience as a Police Officer and Investigator. Nelson Figueroa has a proven track record of investigative and leadership success in the areas of Criminal Investigations, Civil Investigations, Corporate Loss Prevention/Cargo Theft Investigations, Financial Investigations, Organized Crime Investigations, Identity Theft Investigations, Missing Persons Investigations, Narcotics Investigations, Undercover Investigations, Surveillance, Special Weapons And Tactics (SWAT) and as a Crisis/Hostage Negotiator.


Able to set strategic priorities, oversee and direct sophisticated investigations, and demonstrates exceptional liaison skills in working with the District Attorney’s Office, State Attorney’s Office, and other Federal and State Investigative Agencies.


Nelson Figueroa also served honorably in the U.S. Marine Corps for over ten years.






For any inquiries, questions or commendations, please call: (949) 340-4040 or fill out the following form

CA PPO License No. 17343
CA State Private Investigators License No. 27278
CA State Permit for Exposed Firearm No. 327468

Verify our Private Investigator License here: www.BSIS.CA.gov

Career Opportunities

Interested in working for NSI? Please download the application, fill it out and send it back to us via E-Mail at nelson@nsinvestigations.com

Laguna Niguel Location

NSI Investigations, LLC

29911 Niguel Rd. Suite 7703
Laguna Niguel, CA 92607


E-Mail: nelson@nsinvestigations.com

Phone: (949) 340-4040

Fax: (714) 352-5433

Mission Statement

NSI Investigations, LLC is a full-service, private investigation and security firm dedicated to the highest level of investigative and legal excellence. We are committed to providing discrete, confidential detective and protective services.


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