San Francisco

Trusted private detective in San Francisco. Tristar Investigation offers licensed, discreet services for personal, legal & corporate cases.
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Looking for a private investigator in San Francisco, CA, you can trust? For nearly three decades, attorneys, families, and business leaders across the Bay Area have chosen Tristar Investigation. Whether your case involves legal disputes, personal concerns, or corporate issues, our licensed professionals provide fact-based answers with total discretion. From the Financial District and SoMa to Pacific Heights, Mission District, and Sunset neighborhoods, we’ve helped clients uncover the truth, protect their rights, and gain peace of mind.
Private Investigation Services in San Francisco

Choosing a firm in San Francisco means working with investigators who bring decades of experience and in-depth knowledge of the Bay Area. Tristar Investigation’s licensed team manages a wide variety of cases for attorneys, private individuals, and businesses. Below are the primary areas where our investigations provide meaningful results:

Employment & Labor Law Support
San Francisco’s dynamic workforce keeps employee rights at the forefront. Our team assists employment attorneys handling wage-and-hour disputes, discrimination cases, and unsafe workplace conditions.
These efforts give employees the opportunity to secure the justice they are entitled to, while providing attorneys with the solid evidence they need to successfully advance their cases.
Asset & Financial Investigations
Before moving forward with a lawsuit or entering settlement talks, it’s essential to know whether the opposing party has the financial resources to satisfy a judgment. Our investigators conduct comprehensive asset searches throughout San Francisco and the greater Bay Area. These searches often uncover:
  • Undisclosed bank accounts, properties, or other valuable real estate.
  • Hidden business interests and investments not previously revealed.
  • Outstanding debts or financial obligations that could impact recovery.
By identifying these assets, we give attorneys and clients the clarity they need to make informed legal decisions and protect their financial interests.
Surveillance & Injury Claim Verification
Insurance defense lawyers turn to us for subrosa surveillance. We discreetly monitor individuals to confirm the validity of injury or workers’ compensation claims. By documenting daily activities on video, we expose fraudulent or exaggerated claims that could otherwise cost insurers and employers significant losses.
Process Service & Legal Support
When it comes to serving legal documents, we handle difficult service of process cases across San Francisco. Our investigators research addresses, identify vehicles, and conduct stakeouts until papers are successfully served. This persistence ensures cases stay on schedule, even when subjects attempt to evade service.
Estate & Probate Investigations
Probate attorneys trust us to locate heirs and verify family relationships. Through heir searches and due diligence reports, we help ensure fair distribution of estates while minimizing the risk of disputes.
Accident & Personal Injury Investigations
Accident and personal injury investigations are another area of focus. We perform video canvasses to locate security footage, gather evidence at accident sites, and take recorded telephonic witness statements that are transcribed for use in court. Acting quickly gives attorneys and victims the strong evidence they need to support their claims.

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When you’re seeking answers, choose a San Francisco detective agency you can rely on. Contact Tristar Investigation today for a free, confidential consultation, and let one of our private investigators provide the clarity you need.
Expanded Services for Every Need
Beyond these core areas, Tristar Investigation provides a full suite of specialized investigative services:
Surveillance & Monitoring
  • Spousal/Domestic Surveillance: We conduct discreet surveillance for spouses or family members to confirm suspicions, reveal hidden activities, and provide clear evidence you can rely on.
  • Cheating Spouse: If you suspect infidelity, our investigators collect photographic and video proof, along with detailed reports, to help you make informed personal or legal decisions.
  • Subrosa Surveillance: Often used in insurance or legal cases, this undercover surveillance uncovers hidden lifestyles or false claims without alerting the subject.
  • Injury Surveillance: We record the daily activities of individuals claiming injury to verify if their behavior matches their stated limitations, helping to prevent fraudulent claims.
  • Business Surveillance: We offer customized business surveillance to monitor employee behavior and safeguard company assets, reducing risks and preventing losses.
Family & Custody Matters
  • Child Protection: We gather documentation in cases involving suspected neglect, abuse, or unsafe living conditions to ensure children remain safe.
  • Runaway Teenagers: Our investigators act quickly but carefully to locate missing or runaway teens and bring them back to safety.
  • Missing Persons: Whether it’s a recent disappearance or a long-lost connection, we use advanced tools and networks to track people down.
  • Divorce Investigations: We uncover hidden assets, infidelity, or concerning behavior that can influence the outcome of divorce proceedings.
  • Find Someone: From biological relatives to old friends, we help clients reconnect with people from their past through verified searches.
Fraud & Scam Investigations
  • General Fraud and Scams: We investigate both online and in-person scams, exposing schemes and providing concrete proof for legal or personal use.
  • Workers’ Compensation Fraud: We verify injury claims to protect employers and insurance providers from fraudulent payouts.
  • Bankruptcy and Foreclosure Fraud: We investigate hidden assets and false filings to uncover fraud in financial cases.
Background Checks & Due Diligence
  • Past Verification: We provide reliable reports on potential partners, tenants, or associates to give you peace of mind.
  • Business Research: We authenticate companies, their ownership structures, and hidden affiliations before you commit.
  • Executive Background Checks: We perform extensive background checks for SEC certification, interviewing references and reviewing litigation history.
Legal Support Services
  • Witness Outreach: We locate, contact, and prepare witnesses while protecting their confidentiality.
  • Witness Statements: We collect accurate, court-ready statements that support legal arguments.
  • Process Service: We deliver subpoenas and other documents even when individuals are evasive.
  • Subpoena Services: We serve subpoenas efficiently to ensure timely compliance.
Asset & Financial Investigations
  • Asset Investigations: We identify property, vehicles, and accounts relevant to divorces, lawsuits, or financial disputes.
    Asset Recovery: We track down and help recover stolen or missing property.
Corporate & Employee Investigations
  • Employee Theft: We investigate cases of internal theft or fraud within companies, documenting evidence for legal or business action.
  • Intellectual Property Protection: We detect counterfeiting, piracy, and misuse of trademarks or patents.
  • Corporate Intelligence: We provide competitor and market insights to guide business strategy and reduce risks.
  • Loss Prevention: We investigate and recommend strategies to reduce theft, fraud, and operational losses.
  • Employment Law Investigations: We provide attorneys with factual reporting on workplace disputes, discrimination, or violations.
  • Employee List Research: We compile verified workforce information needed for litigation or corporate use.
Specialty Investigations
  • Spanish-Speaking PI: We provide fluent Spanish-speaking investigators for clients who prefer communication in Spanish.
    Bilingual Claims Investigator: We bridge language gaps in accident and insurance cases to ensure accuracy in investigations.
    Accident Investigations: We collect on-scene evidence, interview witnesses, and review records to establish liability.
    Insurance Accident Investigations: We confirm or challenge claim details, uncover fraud, and clarify responsibility.
Whether you’re searching for a private investigation agency with resources across California or a discreet investigator based in San Francisco, Tristar Investigation delivers the perfect combination of experience, adaptability, and reliable results.
Why Choose Tristar Investigation?
With more than 28 years of experience, Tristar Investigation remains a trusted name in private investigations.
Our San Francisco investigators work with accuracy and discretion, supported by recognition from CNN, the Los Angeles Times, and a long list of satisfied clients.
Privacy is central to our investigative work. At Tristar Investigation in San Francisco, we rely on secure communication and discreet practices to safeguard your information and protect your confidentiality at every stage.

Here’s what you can expect:

Our Commitment to You

We only accept cases where we’re confident we can deliver results. From the moment we begin, we prioritize your satisfaction, provide easy-to-read reports without confusing jargon, and follow up to ensure your expectations are met.
We understand these cases are personal and sensitive. That’s why every investigation is conducted with professionalism, respect, and absolute discretion.