
Private Investigation Agency
Top San Francisco Private Investigators
Learn about what to know, cost and more!
Servicing San Francisco County, Martin Private Investigation Services will protect you, your family, and your business. Martin Investigative Services has over 40 years of investigative experience, and our private investigators are former supervisory Federal agents.
If you think you need the best private investigators, you must have a serious personal or business issue requiring expert assistance.
Call (800) 577-1080

Private Investigation Agency – San Francisco County, CA.
When choosing a private investigator, ask the right questions.
We are the most experienced San Francisco County private investigator agency one can find! Our licensed private investigators will research your matter from missing persons to digital forensics, insurance fraud investigations, background checks, missing person, and video surveillance, bug sweep while offering a free consultation.
Private investigation can find proof and information that protects you, your family, or your business.
Here at MartinPI, our professional private investigators are licensed, have extensive experience, abide by the law, advise you on your situation, and explain what you can and cannot do.
And here at MartinPI, we always give you a free consultation.
Private Investigator San Francisco Cost
The cost of private investigation services in San Francisco, CA can vary depending on the complexity of the investigation, ranging from $495 to $2500. Private investigators have access to a variety of resources that enable them to gather crucial information and provide accurate results to their clients.
When choosing a private investigator, ask the right questions.
Whether or not you choose Martin Investigative Services, ask the right questions so you can hire a private investigator worth their salt. In speaking with Tom Martin, the best San Francisco County private investigator, he will determine your investigative needs and ensure your answer promptly while being cost-effective. Tom Martin’s professional manner is courteous, and he will listen to the details and choose the legal action you need to take.
Is a private investigator licensed?
California is one of the more demanding states concerning the requirements for private investigators. Currently, California requires the following to become a private investigator:
- A criminal history background check through the California Department of Justice (DOJ)
- 6,000 hours of fieldwork
- Passing a California administered test
Tom Martin has been working as a private investigator for 50 years and has mastered the latest technology while offering free consultations. Your situation is kept as a private matter and all sensitive information is submitted to you and we keep nothing.
Does the private investigator have a background in law enforcement?
A good private investigation company in California will have a background in law enforcement and many years of professional private investigation experience.

MartinPI Private Investigation Case Study:
Somebody Is Watching You
We were recently retained by a large well-known civil law firm in San Francisco that renders legal advice to financial institutions in the financial district of San Francisco. They were interested in our in-house computer system and how it could help with asset searches and recovering monies owed from current judgments.
One of the senior attorneys shared with me that her daughter, a lawyer in another firm, was concerned that someone was “tapping” her phone and computers while she performed legal work for her firm at home.
We advised that we could perform an electronic eavesdropping detection sweep at her home. He was advised this was not a sideline for us but an integral part of our business. She was also referred to our website, which deals with this subject matter, bugsweep.
Results:
Our staff performed a two-day, three-phase sweep of the subject’s residence. Our technician found a small camera secreted in the master bedroom of the home. The subject was advised and immediately suspected her recently divorced husband.
Our investigative staff devised a plan so that the husband was to take their two children while our client went away on business. Surveillance was maintained on the residence, and shortly after her departure, our surveillance investigators observed the ex-husband enter the home with a key.
Our staff previously placed cameras recorded the ex removing his hidden camera in our client’s bedroom. The local law enforcement agency was notified, and charges are currently pending with the local police and district attorney’s office.
Can the private investigator testify in a court of law?
In the litigious state of California, an excellent private investigator will know the system and how to work within it.
Investigations should yield court-admissible evidence, but your investigator should also be able and ready to testify in support of this evidence. Many San Francisco County private investigators do not have this experience or background.
Martin Investigative Services gathers only court-admissible evidence, and all investigators are considered experts in a court of law.
Does the private investigator have a physical office?
A professional private investigator will always have an office. It is pervasive for private investigators not to have offices in California, preferring to meet at restaurants or communicate by phone or email only. These investigators should be eliminated from consideration as you need to know you’ll be able to locate this person again once you’ve handed over a payment.
Martin Investigative Services has Corporate Offices in Newport Beach, CA., and offers services throughout California, the U.S., and even a few select foreign countries.
Does the private investigator clearly define the fees involved?
When you contact a private investigator, explain the service you would like performed and ask how much it will cost.
A professional private investigator will provide an accurate estimate without your approval and not exceed the quote.
Your first conversation with any reputable private investigator should always be at no charge.
Martin Investigative Services will always provide you with an estimate upon our first conversation. All consultations remain free and confidential.
Do you have a good gut feeling about the need for a private investigator?
Private investigators know that very often, your intuition is correct. When we speak for the first time, ask yourself if you feel good about it. What is your immediate gut reaction?
Make sure the private investigator thoroughly understands your situation and that you feel comfortable. You should feel they are looking out for your best interests. Your needs should always come before money.
Martin Investigative Services will always make an effort to understand your specific investigative need and tell you whether or not we can help so that you can move forward in any event.
Why would you trust anyone but a highly qualified private investigator?
The private investigators of Martin Investigative Services are former Federal agents that are experts at providing you proof that is admissible as evidence in a court of law.
Investigators have extensive experience in investigative law and reporting techniques, background investigations, surveillance, interrogation, fraud investigation and litigation issues, and information searches.
- Get your free consultation.
We are supporting you the whole way.
Ongoing partnerships with San Francisco County law enforcement, legal representation, and industry professionals enable Martin Investigative Services to provide a full range of support in your time of need.
- Get your free consultation.
Why not call? It’s free and confidential.
If you are experiencing trouble in your business, with a spouse or partner, family member, or an employee, or you feel you’re in danger, call. You can speak with a seasoned private investigator on a one-on-one basis.
When an in-person meeting is necessary, investigators can meet you at Martin Investigative Services’ Newport Beach offices or a location of your choice. Your appointment and services performed will be kept in total confidence.
Contact Martin Investigative Services today for your private consultation.
Call us today at 1-800-577-1080.
Martin Investigative Services has performed background checks, private investigation, surveillance and bug sweeps for our clients. They have also served difficult process in lawsuits. They have performed unquestionably and unfailingly to perfection. We will always call Martin first – and hope he hasn’t been called yet by the other side!
Wall Street Journal – Martin Investigative Services
One Tough Day for Two-Timers As Cheaters Juggle Valentines, Private Eyes Work Overtime; The Feb. 14 ‘Business Trip’ Link to the Wall Street Journal By Nancy Keates It was the Valentine’s Day card that finally cracked the case for private detective Art League. Mr....
Reasons for Hiring a Private Investigator – Martin PI
19 Reasons to Hiring a Private investigator Reasons to Hire a Private Investigator If you live in California and a metropolitan like Los Angeles, Orange County, San Francisco, San Diego, or any other county, understanding how to hire a private investigation company is...
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Bug Sweep (TSCM) Bug sweeps, or Technical Surveillance Countermeasures (TSCM), are becoming increasingly popular among individuals and businesses. In today's digital age, protecting sensitive information from unwanted surveillance is more important than ever. This...
Your Husband Or Boyfriend Is Not In The CIA Or A Navy Seal
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Private Investigator Surveillance Los Angeles | Surveillance
Private Investigator Surveillance Los Angeles Did you know the number of missing persons in the U.S. has reduced to 521,705 cases by 2021 since 1990? According to the statistics, it is the lowest number ever registered. The technique and technology integrated by...
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Uncover Infidelity on Valentine's Day: Cheaters Exposed You must have felt that nagging and sick feeling that your spouse or significant other could be cheating at one point or even now. You may have already seen the signs and are willing to search for evidence to...
How to Find a Missing Person
Missing Persons Private Investigator
Needing to find a person, a long lost friend, an adult family member?
We know the angst sometimes a lost person brings to a family. After 50 years of service, we have the knowledge to digitally search at the deepest levels. Finding someone who doesn’t want to be found is a daunting task. Here at Martin Private Investigations, we are equipped with the largest databases to help you, find who you’re looking for.
From adoption search, finding deadbeat dads, finding biological parents, missing persons in Mexico, missing person with mental illness and more, we can help.
Private investigator to find someone
We have found thousands of missing people, e.g., finding a missing relative. We search high and low to help find loved ones. Learn more about:
Our private investigators have helped thousands of people trying to locate someone.
Asset Search
Properties | All Types of Accounts
Types Of Asset Searches We Conduct
Be sure nothing is left uncovered when Martin PI conducts an private investigator asset search at the start of the investigation process. We also offer private investigator services for lawyers.
Private investigator to find someone
Our financial investigations do the following:
- We research billions of records, not always available in public databases.
Here at MartinPI, we have access to the deepest of databases. Asset search takes time and dedication. We have thousands of asset searches with great success. Start and Call (800) 577-1080.
Bug Sweep Detection
Find out How to tell if a room is bugged. You see if you suscept someone nefarious around you, hire somone to check for hidden cameras. Peace is a call away.
Need to bug sweep your property? If you are a home owner or business owner, learn about the following:
The professional name for a bug sweep is an electronic surveillance detection sweep. This is a full-scale inspection that is performed in 3 phases over 2 days.
Bug sweep service is important to not only find the bugs that may be hidden, but to find the people that planted them in the first place! We guarantee that we will find any and all eavesdropping devices secreted in your home or workplace. Learn more about how to find a hidden camera.
Home, Vehicle, Corporate Office Sweeps
Our private investigators are former Federal agents that have decades of experience with these situations.
Surveillance Services
Set Up a private and free consultation
The most common surveillance services we perform involve:
- If you suspect your husband, wife, or partner of infidelity, we can help you prove or disprove your suspicions by hiring a private investigator for cheating. If we catch a cheating spouse, the proof can help save you money, help with child custody, and undue burden during legal / divorce proceedings.
Infidelity Surveillance
- Signs your wife is cheating
- Boyfriend disappears for hours.
- For companies that suspect an employee of internal theft, embezzlement, vandalism or fraud, we provide employee surveillance.
- We provide workers comp surveillance to weed out fraudulent worker’s compensation claims.
- Husband disappears for hours
- How can I find out if my husband stayed at a hotel?
- Marital infidelity investigator
Private Investigation Service
Orange County Private Investigator | Los Angeles Private Investigator
The private investigators of Martin Investigative Services are former Federal agents that are experts at providing you proof that is admissible as evidence in a court of law. Learn the risks of hiring a private investigator.
Investigators have extensive experience in investigative law and reporting techniques, background investigations, surveillance, interrogation, employee fraud investigation and litigation issues, and information searches.
Hiring a Private Investigator
Martin Investigative Services gathers only court-admissible evidence and all investigators are considered experts in a court of law. We are located in Southern California and serving the continental US.
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Corporate Investigation
Stop employee theft.
Do you think your employees are stealing from you? Do you suspect them of illegal activities at work? Are they sleeping on the job?
There is a relatively simple solution to your problem: Our interrogation and interview services get results quickly. All information gathered is court-admissible.
Prevent corporate espionage
In an increasingly competitive marketplace, corporate espionage is commonplace.
We offer full investigations that maintain the integrity of your business security, and include bug sweeps, surveillance, interrogations of employees, employee fraud investigations and more.
Background Searches
Performed and reviewed by former Federal agents.
More often than not these services offer results of mixed quality by using dated sources that provide only pieces of information, with no quality assurance or professional review.
Employee Background Check
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When you get a private investigator background check at Martin Investigative Services, we use the largest database of public information in the United States. Are you getting married? It’s highly suggested to complete a Pre-marital background check.
Equally important: Your results are personally reviewed by private investigators who are former supervisory Federal agents.
