About Tristar Investigation
A Trusted Private Detective Agency in California for Over 40 Years
At Tristar Investigation, we’ve built our reputation as one of the most respected private investigation companies in California. For more than three decades, we have provided individuals, attorneys, insurers, and businesses with discreet, professional, and results-driven investigative services. Our team of licensed private investigators in California combines experience, technology, and legal precision to uncover the truth.
Most Trusted Services in California
Trusted Statewide
We provide specialized investigative and legal support for attorneys, businesses, insurers, and individuals. Our top services focus on the areas where we deliver the greatest impact, uncovering fraud, locating witnesses, protecting assets, and keeping legal cases on track. With decades of proven results, these six services are the foundation of why clients across California trust us.
Employment Law Services
From employee list development to bilingual witness outreach, we help employment law teams reduce delays and build stronger Class Action and PAGA cases.
Difficult Service of Process
Investigative service of process for evasive or hard-to-locate individuals, using research, fieldwork, and strategic attempts to complete lawful service when standard methods fail.
Asset Investigations
Our asset investigations help locate hidden assets, confirm ownership, and document financial profiles that support recovery efforts, enforcement actions, and post-judgment strategy.
Estate & Probate
Estate and probate investigations that help attorneys resolve unanswered questions, reduce disputes, and prevent delays by replacing uncertainty with verified, well-documented facts.
Cheating Spouse
Cheating spouse investigations that provide clear, factual answers through professional surveillance and documentation, helping individuals understand their situation and make informed decisions.
Subrosa Surveillance
Discreet subrosa surveillance that documents real-world claimant activity, helping insurers verify reported limitations, identify inconsistencies, and make informed, defensible claim decisions.
Services Offered
Comprehensive Investigations Tailored to Your Needs
We offer a wide range of professional investigative services, tailored to meet the unique needs of individuals, families, businesses, attorneys, and insurers.
Employment Law Services
Plaintiff employment law teams rely on our structured investigative approach to employee list research and witness outreach, ensuring dependable information and progress throughout Class Action and PAGA cases.
Difficult Service of Process
We handle difficult service of process cases involving evasive subjects, urgent timelines, and failed prior attempts, delivering compliant service supported by detailed documentation attorneys can rely on.
Asset Investigations
Asset investigations for plaintiff attorneys that uncover real and concealed holdings, delivering verified financial intelligence to support litigation strategy, settlement evaluation, and judgment recovery.
Estate & Probate
Discreet investigative support for estate and probate matters, helping attorneys verify assets, locate beneficiaries, clarify financial questions, and move complex cases forward with confidence.
Injury Surveillance
We provide targeted injury surveillance for defense attorneys, delivering clear video and documented observations that help assess credibility and address suspected injury fraud.
Background Checks
Focused background checks designed to confirm identities, uncover inconsistencies, and present organized findings attorneys can rely on throughout litigation and case review.
Asset Investigations
Asset investigations for individuals seeking clarity, helping uncover property, financial interests, or hidden assets to support informed personal or financial decisions.
Cheating Spouse
Our cheating spouse investigations deliver reliable evidence through discreet surveillance, giving clients clarity, peace of mind, and trustworthy information during a difficult personal situation.
Background Checks
We provide confidential background checks for individuals to verify identities, review history, and uncover details that support safer, more informed personal choices.
Fraud & Scams
Fraud and scam investigations that act quickly to uncover deception, track down perpetrators, and provide clear evidence to help victims protect their finances and personal security.
Runaway Teenagers
We help families locate runaway teens, confirm their well-being, and get reliable answers during one of the most frightening and emotional times a parent can face.
Missing Persons
We help locate missing relatives and individuals using proven investigative methods, providing families with answers, direction, and support when contact has been lost.
Skip Tracing
Skip tracing services that help locate individuals who have moved, lost contact, or are difficult to find, providing accurate, up-to-date information you can rely on.
Subrosa Surveillance
Subrosa surveillance services that support accurate claim evaluation by documenting claimant routines and activity levels through lawful, discreet observation.
Background Checks
Insurance defense background checks that help verify claimant histories, identify inconsistencies, and uncover potential red flags to support accurate and defensible claim decisions.
Workers Comp Fraud Subrosa
Workers’ comp fraud investigations that document claimant activity, identify exaggerated or false injuries, and provide clear evidence to support fair and defensible claim decisions.
Insurance Accident Investigations
Insurance accident investigations that document claimant activity, verify reported injuries, and deliver clear, court-ready evidence to support accurate and defensible claim decisions.
Bilingual Claims Investigator
Bilingual claims investigations that provide accurate Spanish and English interviews, clear documentation, and reliable evidence to help insurers evaluate claims without language barriers.
Business Surveillance
Business surveillance services that help identify employee misconduct, fraud, and operational risks, providing reliable evidence to protect company assets and decision-making.
Background Checks
Background checks that help companies verify identities, assess risk, and make informed hiring or partnership decisions using accurate, organized background information.
Workers Comp Fraud Investigations
We investigate suspected workers’ comp fraud by documenting real-world claimant activity, providing businesses with reliable evidence to support fair and informed decisions.
Loss Prevention
Loss prevention services that help businesses identify internal theft, policy violations, and risk exposure, providing clear insight to protect assets and reduce ongoing losses.
Intellectual Property
Intellectual property investigations that help businesses identify infringement, theft, or misuse, providing verified evidence to protect ideas, products, and brand value.
Employee Theft
Employee theft investigations that help businesses uncover internal theft, fraud, or misconduct and provide clear evidence to protect assets and prevent ongoing losses.
Tristar In The News
Stay updated with the latest from Tristar Investigation. Our news and insights highlight real cases, industry trends, and investigative breakthroughs. From high-profile media coverage to practical tips for attorneys and businesses, we share updates that matter.
Featured On
Service Areas
We serve all of California and the USA
Our licensed investigators provide trusted support across California, delivering professional results for individuals, businesses, attorneys, and insurers statewide.
Newport Beach
Irvine
Santa Ana
Chula Vista
Beverly Hills
Glendale
Riverside County
San Bernardino
Santa Clara County
Bakersfield
Anaheim
San Francisco
Sacramento
Alameda County
Fresno
Long Beach
Oakland
San Jose
San Diego
Los Angeles
The Tristar Latest Blogs
Stay informed with expert insights from Tristar Investigation. Our blogs cover real investigative strategies, case studies, and legal perspectives to help clients, attorneys, and businesses make better decisions.
What Our Clients Say About Us
For over three decades, clients across California have trusted Tristar Investigation for discreet, professional, and results-driven services. From individuals and families to attorneys, insurers, and corporations, our private investigators in California are praised for their confidentiality, accuracy, and dedication to uncovering the truth.
Need Confidential Help? Request a Free Consultation
Your case will be handled discreetly by licensed California investigators.