What Is a Private Investigator? A Complete Guide to Investigative Services in Southern California

by Cgroup | Sep 25, 2026 | Hiring a Licensed Private Investigator

What to consider when hiring a licensed Private Investigator? Discretion, Experience and Integrity are KEY!

Have you ever wondered what a private investigator actually does? Or who really hires one? You’re in the right place. This guide answers both questions. It also introduces the investigative services Corinthian Group provides across Southern California. We operate under the license AIR – Agency of Investigation Recon (California PI License #26978), and we serve individuals, attorneys, and businesses alike.

This is the first post in an ongoing series. Each month, we’ll publish a new deep-dive on a specific investigative topic. And we’ll link every future post back to this page, so you’ll always have a home base to start from.

What Is a Private Investigator?

A private investigator, or PI, gathers facts and evidence for a client. That client could be a private individual, an attorney, an insurance carrier, or a business. In California, the Bureau of Security and Investigative Services (BSIS) licenses and regulates every PI. This state agency falls under the Department of Consumer Affairs, and it enforces Business and Professions Code Chapter 11.3.

So how is a licensed PI different from an unlicensed “information broker”? Here’s what sets us apart:

We pass a state licensing exam and background check
We follow California law on privacy, surveillance, and evidence handling
We produce documentation and testimony that holds up in family court, civil court, and criminal proceedings
We carry professional liability insurance

Before you hire any investigator in California, verify their license first. You can do that instantly through the BSIS online license search. We always encourage clients to check.

Who Hires a Private Investigator? (And Why)

Private investigation isn’t just for divorce cases in old movies. Real people hire us for real reasons. Take a look at our most common clients, the problems they bring us, and the service that solves each one.

Client Type	Common Problem	Investigative Solution
Parents & family law clients	Suspected unreported cohabitation, unsafe conditions during custody time	Child Custody & Cohabitation Investigations
Spouses & partners	Suspicion of infidelity, need for documented proof	Infidelity Investigations
Employers & insurance carriers	Suspected workers’ compensation or disability fraud	Workers’ Compensation & Insurance Fraud Investigations
Criminal defense attorneys & defendants	Need for independent fact-finding, witness location, scene documentation	Criminal Defense Investigations
Real estate, agriculture, construction, and other PI firms	Need for aerial documentation or subcontracted surveillance	Aerial Drone Surveillance
Attorneys & businesses	Due diligence, asset checks, background investigations	General Investigative Services

Our Core Specialty: Surveillance Investigations

Surveillance is the heart of what we do at Corinthian Group. Maybe you need to document a parent’s undisclosed household. Or confirm a spouse’s activity. Or catch a fraudulent workers’ comp claim on video. In every case, skilled surveillance builds the same thing: clear, time-stamped, court-ready evidence. Learn more on our Surveillance Investigations page.

Child Custody & Cohabitation Investigations

California family courts take custody violations seriously. But only when solid evidence backs up the claim. That’s where we come in. Our child custody and cohabitation surveillance services help parents in Beverly Hills, Cheviot Hills, Manhattan Beach, Malibu, Rancho Santa Fe, La Jolla, and Del Mar. We gather the documented proof your family law attorney needs to petition the court for a custody modification.

Infidelity Investigations

Suspecting infidelity takes a toll. So does not knowing for sure. That’s why we offer discreet, professional infidelity investigation services throughout Southern California’s most affluent communities, including Laguna Beach, Irvine, La Jolla, Del Mar, and Rancho Santa Fe. Discretion matters most here. So does protecting your reputation. We deliver both.

Workers’ Compensation & Insurance Fraud Investigations

Fraudulent workers’ comp claims cost California employers and insurers billions of dollars every year. Our workers’ compensation and insurance fraud investigations give employers, third-party administrators, and insurance defense attorneys the evidence they need to fight back. We proudly serve the Inland Empire and Riverside County, including Corona, Norco, Eastvale, Rancho Cucamonga, Menifee, Murrieta, Temecula, Fallbrook, Canyon Lake, Alessandro Heights, and Canyon Crest.

Aerial Surveillance & Drone Reconnaissance

Here’s what sets us apart from most PI firms: our principal investigator holds an FAA Part 107 Remote Pilot Certificate. That means we can legally fly commercial drones for aerial surveillance and reconnaissance. Why does that matter to you? Large properties, agricultural sites, construction zones, and hard-to-reach vantage points all become accessible. Learn more on our Aerial Surveillance & Drone Reconnaissance page, where we also explain how we support other licensed PI firms that need subcontracted drone coverage. You can also review the FAA’s official Part 107 requirements at faa.gov.

Criminal Defense Investigations

A strong criminal defense needs independent investigation. That means locating and interviewing witnesses. It means documenting the scene. And it means reconstructing the timeline with evidence law enforcement may have missed. For criminal defense investigative support in California, visit our Criminal Defense Investigations page.

Why Work With a BSIS-Licensed, FAA-Certified Investigator

An unlicensed investigator can put your entire case at risk. Evidence gathered illegally, or by someone without a license, may not hold up in court. It could even expose you to liability. Corinthian Group operates under AIR – Agency of Investigation Recon, California PI License #26978, registered with the Bureau of Security and Investigative Services. Before you hire us, or anyone else, verify the license through the BSIS license search.

Want to learn more about the profession? These two independent organizations are great places to start:

California Association of Licensed Investigators (CALI) — the largest state PI association in the country, with consumer education and a “Find an Investigator” directory
National Council of Investigation and Security Services (NCISS) — the national association representing licensed investigators before Congress and state legislatures

Our Southern California Service Area

We proudly serve Southern California’s most affluent communities, including:

Los Angeles / Westside: Beverly Hills, Cheviot Hills, Manhattan Beach, Malibu Orange County: Laguna Beach, Irvine San Diego County: La Jolla, Del Mar, Rancho Santa Fe, Fallbrook Inland Empire / Riverside County: Corona, Norco, Eastvale, Rancho Cucamonga, Canyon Lake, Murrieta, Temecula, Menifee, Alessandro Heights, Canyon Crest

Frequently Asked Questions

What can a private investigator legally do in California? A licensed PI can watch and document activity from public locations. We can also review public records and interview willing witnesses. Then we compile everything into documentation for legal proceedings, always within California privacy law.

Is surveillance footage admissible in family court? Often, yes. California family courts regularly admit surveillance evidence when a licensed investigator documents it properly. That said, admissibility depends on how we obtained it and how your attorney presents it. So always loop in your family law attorney early.

How much does a private investigator cost? It depends. Your specific type of case, how may investigators will be required, the duration of the investigation (how many hours and or days), and whether you need aerial support or other important services all affect the cost. The details matter. Investigations and surveillance specifically aren’t a one size fits all service. Most surveillance investigations run on an hourly rate plus an upfront retainer. Contact us for a quote based on your specific case.

Do you work with attorneys and other investigation firms? Yes, often. We regularly support family law attorneys, criminal defense attorneys, and insurance defense counsel. We also partner with other licensed PI agencies that need subcontracted surveillance or FAA-certified drone coverage.

Get Started

Are you facing a custody dispute? Do you suspect infidelity? Are you managing a questionable workers’ comp claim? Or do you simply need aerial documentation? Either way, Corinthian Group can help. We work discreetly, legally, and deliver evidence that stands up. Contact us today to discuss your case confidentially.

Corinthian Group is a registered trade name of AIR – Agency of Investigation Recon, California PI License #26978, licensed by the Bureau of Security and Investigative Services. Our principal investigator also holds an FAA Part 107 Remote Pilot Certificate.

Family Law Investigations: Protecting What Matters Most Through Facts, Evidence, and Professional Investigation

by Cgroup | Aug 7, 2026 | Family Law Investigations

How Video Evidence Can Protect Your Family's Future

Family law disputes are among the most emotionally challenging legal matters a person can face. Whether you're dealing with a divorce, child custody dispute, hidden assets, or violations of a court order, reliable evidence can make a meaningful difference.

A professional family law investigation helps uncover objective facts so that attorneys, mediators, and courts can make informed decisions based on evidence rather than allegations.

At Corinthian Group, we specialize in discreet, professional investigations throughout California. Our investigators gather legally obtained evidence that may help support your attorney's legal strategy while protecting your privacy throughout the investigative process.

What Is a California Family Law Investigation?

A family law investigation is the professional collection of information, documentation, and evidence related to domestic legal matters.

Unlike television dramas, private investigators do not rely on guesswork. Every investigation is conducted using lawful investigative techniques designed to document facts accurately and ethically.

Depending on the circumstances, an investigation may include:

Surveillance
Witness interviews
Background investigations
Asset searches
Employment verification
Social media investigations
Skip tracing
Public records research
Photo documentation
Video documentation

The objective is simple: provide accurate, well-documented information that may assist attorneys and courts in evaluating the facts of a case.

Why Evidence Matters in California Family Court

Family courts such as LA CountyCourt, Orange County Court, Riverside County Court, San Bernardino County Court and San Diego County Courts are tasked with making decisions that can affect families for years to come. Judges often hear conflicting testimony from both parties.

Objective evidence helps reduce uncertainty.

Instead of relying solely on personal statements, courts may consider documentation such as surveillance footage, photographs, verified timelines, public records, and witness statements when those materials are lawfully obtained and admissible.

Professional investigations help replace assumptions with documented facts.

When Should You Consider Hiring a Family Law Investigator?

Many people wait until shortly before trial to seek investigative assistance.

In reality, earlier is often better.

Evidence can disappear quickly.

Social media posts are deleted.

Witnesses move away.

Financial records change.

Digital communications may no longer be available.

The earlier an investigation begins, the greater the opportunity to preserve valuable information before it is lost.

Family Law Cases That Frequently Benefit From Professional Investigation

Every family law matter is unique. However, several situations commonly involve investigative services.

Child Custody Investigations

Document parenting behaviors, living conditions, visitation compliance, and activities that may be relevant to the child's best interests.

Hidden Asset Investigations

Identify businesses, real estate, financial interests, or other assets that may require additional legal review during divorce proceedings.

Cohabitation Investigations

Determine whether an individual is residing with another person when that information may be relevant to support obligations or other legal issues.

Surveillance Investigations

Professionally document activities through lawful surveillance while maintaining strict confidentiality.

Background Investigations

Verify employment history, criminal records, civil litigation, business affiliations, and publicly available information relevant to a family law matter.

Benefits of Hiring a Licensed California Private Investigator

Working with an experienced investigator offers several advantages.

Objective evidence collection
Professional surveillance techniques
Detailed investigative reports
Court-ready documentation
High-quality photographs and video
Witness interviews
Public records research
Confidential case management
Coordination with attorneys
Ethical and lawful investigative practices

Why Clients Choose Corinthian Group

Selecting the right investigator is an important decision.

At Corinthian Group, every investigation is conducted with professionalism, discretion, and integrity.

Our team understands that family law matters often involve children, financial security, and life-changing court decisions. That's why every investigation is tailored to the client's unique circumstances while maintaining the highest ethical standards.

We believe facts—not assumptions—should guide legal decisions.

Want to walk into your next meeting prepared?

Download our free Family Law Investigation Preparation Checklist today.

This simple tool helps you organize the key information ahead of time — so you can make the most of your time with your attorney or private investigator.

Child Custody & Cohabitation Surveillance: Protecting Children, Preserving Reputations, and Exposing the Truth

by Cgroup | Jul 31, 2026 | blog, Child Custody and Cohabitation Surveillance Investigation

When Allegations Alone Should Never Determine a Child’s Future

In today’s family courts, allegations can carry serious weight. In fact, they can directly influence temporary custody orders, visitation schedules, child support obligations, and even a parent’s reputation. Unfortunately, though, not every accusation is backed by facts. During emotionally charged divorce and custody cases, false or exaggerated claims about parenting, living arrangements, finances, or personal conduct are sometimes treated as fact before any real evidence exists.

That’s why, at Corinthian Group, we believe judges, attorneys, and parents all deserve objective evidence, not speculation.

For more than two decades, our licensed California private investigators have conducted sophisticated child custody and cohabitation surveillance investigations throughout the state. Our mission is simple: gather legally sound, professionally documented evidence. As a result, family law attorneys and their clients can make informed decisions based on facts, not assumptions.

Experience Matters When Everything Is on the Line

Child custody investigations require far more than simply following someone with a camera. Instead, successful family law surveillance demands strategic planning, behavioral analysis, legal awareness, and exceptional patience. It also requires advanced surveillance techniques and the ability to stay completely covert, even under difficult circumstances.

Over the years, our investigators have logged thousands of hours on cases involving:

Child custody disputes
Parenting time and visitation compliance
Cohabitation investigations
Child support modification matters
Hidden income investigations
Lifestyle verification
Parental fitness investigations
New partner background investigations
High-conflict family law litigation

Because every family is different, we customize each investigation around the specific legal issues in your case. Simply put, no investigation should ever follow a one-size-fits-all approach.

Supporting Family Law Attorneys with Actionable Intelligence

Experienced family law attorneys understand that credible evidence often makes the difference between competing narratives.

That’s why Corinthian Group regularly partners with legal professionals to build investigative strategies that support their litigation goals, all while staying fully within California law. Whether you’re preparing for mediation, settlement talks, temporary orders, or trial, our investigators focus on one thing: gathering evidence that holds up under legal scrutiny.

Specifically, our detailed reports provide attorneys with organized timelines, documented observations, and professionally captured photos and video. We also include supporting documentation to assist with case preparation.

Ultimately, professionally gathered evidence does more than just create conflict. Instead, it often clarifies disputed facts, encourages realistic negotiations, and helps reduce costly litigation.

Cohabitation Investigations: Verifying Living Arrangements

One of the most common issues in post-divorce cases involves cohabitation.

For example, a former spouse may claim to be living independently, even though evidence suggests someone else has effectively become part of the household. When this happens, significant financial and legal issues can follow.

Because of this, our cohabitation investigations are designed to objectively document observable facts. These may include patterns of residency, overnight stays, shared routines, vehicle usage, and household activity, along with other legally relevant behaviors that could support your attorney’s strategy.

Throughout every investigation, our work stays lawful, ethical, and discreet.

Serving Affluent Clients Who Demand Absolute Confidentiality

High-net-worth individuals often face unique challenges during family law disputes.

For instance, business executives, physicians, entrepreneurs, professional athletes, entertainers, and public officials frequently need an investigative firm that can operate with exceptional discretion.

At Corinthian Group, we understand how important it is to protect both legal interests and personal reputations. That’s why our investigators treat privacy as just as valuable as the evidence itself. Every assignment is handled with strict confidentiality, professional communication, and careful planning designed to minimize unnecessary exposure.

The Value of Professional Surveillance

Professional surveillance isn’t about invading someone’s privacy. Rather, it’s about documenting observable facts that can either support or refute claims made during litigation.

In many cases, surveillance benefits everyone involved. Specifically, it can help by:

Confirming that allegations are accurate
Demonstrating that accusations are unsupported
Identifying potential safety concerns involving children
Providing objective documentation instead of conflicting testimony
Assisting attorneys in evaluating settlement opportunities
Helping courts make decisions based on reliable evidence

Sometimes, the greatest value of an investigation is simply confirming that nothing improper is happening. After all, objective truth benefits everyone involved.

Technology Combined with Experience

Modern investigations require far more than just cameras.

That’s why Corinthian Group combines decades of surveillance experience with continually evolving technology and techniques. Together, this approach helps us maximize efficiency while still maintaining full discretion.

For every assignment, our investigators carefully evaluate the best strategy. This includes considering the legal objectives, expected activity patterns, location challenges, and any available intelligence. As a result, we’re able to deliver a thorough, professionally documented investigative approach.

Your Child Deserves Facts, Not Assumptions

Few legal matters carry more emotional weight than determining what’s truly best for a child.

Whether you’re trying to protect your children from dangerous circumstances or defend yourself against unfounded allegations, professionally gathered evidence can bring clarity during one of life’s most difficult moments.

At Corinthian Group, we believe every family law case deserves an investigation built on integrity, professionalism, and objective fact-finding.

So, if you or your family law attorney need experienced child custody or cohabitation investigators anywhere in California, contact Corinthian Group today to schedule a confidential consultation. Together, we’ll build an investigative strategy tailored to your case, backed by the reliable evidence your attorney needs to advocate effectively on your behalf.