Best Alameda County Detective Agency

Welcome to Tristar Investigation, Alameda County’s Premier Detective Agency. With an impressive 28-year track record of delivering exceptional results, we proudly serve the Alameda County area and clients worldwide.

Whether you are an individual in need of an Alameda private investigator or a professional in the legal, business, or insurance field, our personalized and professional approach is tailored to meet your specific needs. Our dedicated team of seasoned investigators, including experienced law enforcement professionals, possess the skills, resources, and unwavering commitment needed to deliver outstanding results for your investigation.

Your confidentiality is our top priority, and our meticulous attention to detail sets us apart. Tristar Investigation, trusted by reputable media outlets such as The New York Times, CNN, and The Los Angeles Times, is the go-to choice for exceptional investigative services in Alameda County and beyond. Take control, uncover the truth, and contact us today.

Take Charge. Get Answers. Call Now.

What to Expect from a Private Investigator in Alameda County

The workings of a detective agency are often shrouded in mystery and distorted by over the top depictions in television and film.  Your confidence and peace of mind are our first priority at Tristar, so we make the process transparent and easy to comprehend.

Here’s what we will do:

  • Consult with you to determine what your needs are
  • Together we will develop a strategy obtain the results you want
  • Discuss the costs and map out a plan that will minimize your costs
  • Tell you the time frame for which you can expect your investigation to be conducted
  • Assign an experienced agent to conduct the investigation
  • Communicate with you consistently during the process of the investigation
  • Deliver to you the results in the form of a detailed report and video when appropriate
  • Follow up with you to be sure you are satisfied with the service provided

Confidentiality:  We know that often your association with a private investigator is something that must be kept confidential.

We will create a game plan that insures this.  For instance if you can take phone calls, the first thing we will say is “are you free to talk?” If you can’t talk at the time, you can say “wrong number.”  Texting and email are other alternative ways in which we can communicate.



Pleasanton CA
PI Shadow on Street

How to Hire a Private Investigator in Alameda County

We are ready to initiate your investigation assignment.  On this page there are several ways to get the ball rolling, including calling or emailing us for a free price quote and consultation.

Still wondering if Tristar is the right investigative agency for you?  Here is what to look for in a Alameda County Private Investigator:

  • How long have they been in business?
  • Is the agency licensed, bonded and insured?
  • Are all the investigative agents licensed and experienced?
  • Does the agency have references they can give that you can verify?
  • What professional associations do they belong to?
  • Are the agents working the case local Alameda County private investigators?

Why choose Tristar Investigation?

  • We have been doing business in California for over over 30 years
  • We are licensed, bonded and insured for over two million dollars
  • All our agents are experienced licensed California private investigators
  • Our founder is a nationally known investigation expert
  • There are dozens of well known California lawyers who review us with high praise
  • We are members of numerous prestigious professional investigation associations
  • The agents working your case will be local Alameda County private investigators.

Our Promise to You:

We will not undertake your case unless we are confident we can provide the service you desire.  Once we take your case we will conduct the investigation in a timely and professional manner, with your full satisfaction as our goal. At the conclusion we will deliver a concise and well written report.  Most of all we will follow up to be sure that you are satisfied with the service provided.

We look forward to the opportunity to serve your investigation needs. We know investigative matters often involve highly charged, private situations that require the utmost discretion.  We are sensitive to this and know how to minimize your stress in handling matters of a delicate nature.  Call or e-mail, we’ll give you the information you need to make a decision that will lead to the peace of mind you are looking for.