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Action Surveillance Bureau Tristar Investigation is a full-service detective agency with a 30+ year track record of delivering first-class investigative results in California and for clients worldwide. Tristar Investigation has served as a legal investigator in California for over 30 years. We keep focused on the special needs of the attorneys conducting investigation through our involvement in professional organizations and continuing education for legal investigators.

Catching a cheating spouse or "significant other" requires the skills of a private investigator.
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Los Angeles private investigator Tristar Investigation is a full-service detective agency helping clients worldwide with investigative needs in California and throughout the U.S. For over 30 years we have served the legal, insurance and business communities, as well as private parties. We're a member of the National Association of Legal Investigators, the California Association of Licensed Investigators and the National Council of Investigation and Security Services.Our investigators are well trained seasoned professionals averaging six years experience.
Tristar Investigation has been serving the needs of individuals for over 30 years. These situations often involve delicate personal matters that require discretion and absolute confidentiality. Perhaps you have never contacted a private investigator before. You are not alone, well over 80% of individuals that call us have never engaged the services of an investigator before.
Catching a cheating spouse or "significant other" requires the skills of a private investigator. Cheaters and those involved in infidelity expend a great deal of energy keeping their affair hidden. To make things more difficult, the motto of any cheating spouse is "deny, deny, deny!". Read some Common Questions people ask, or the 30 Signs of Infidelity checklist.
Domestic surveillance is the method used to discover if spouses are cheating on each other. It can involve husbands, wives, boyfriends or girlfriends. Also referred to as "tailing someone" it is the technique of putting an investigator out in the field who follows the suspected cheater to document their activities without their knowledge.
Reviews (11)
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Talal Algabsani
Apr 27, 2020
I have called him to see if i can hire him to investigate my case. He was so honest and outspoken. After explaining the case, he advised me to not hiring a private investigator in such a situation, and he told me it will be wasted money.
Noel G.
Jun 22, 2017
Thanks for the quick response to a request to locate a travelling veteran partner. Very helpful and I would recommend this business for their professionalism.
Hollie Gruber
May 06, 2017
Bruce and Kelly at Tristar were simply amazing to work with. I googled around to try and find the best Private Investigator in all of California, and honestly Tristar just seemed so legit and professional. They went to work right away for me, they were caring and deeply committed towards helping me. If you're looking for a seasoned expert team that is 100% discreet, honest and ethical, Bruce's team of talented well trained PIs will deliver great results, you will not be disappointed!
Arsen Rabinovich
Apr 04, 2017
Best private investigator in town. Bruce and his team are simply amazing, very professional, easy to communicate with and go above and beyond for their clients.
C. Rigby
Mar 04, 2017
Very prompt, professional and a great job understanding our needs and delivering on them. Highly recommend their services!
Sharifi J.
Dec 02, 2016
I have been using Tristar Investigations for all my investigation needs for over 15 years. They are diligent, responsive and are great at what they do. Kellie is amazing. Highly recommended!
Matt K.
Jun 16, 2016
Kellie Anguiano from TriStar handled my business related investigative matter in a professional, expedient manner. She remained in close contact with me via telephone and email until the job was done, and then provided me immediately with her written report. Fees were reasonable and although she ended up having to go to the location twice to complete the job, she left her fee as a courtesy at the agreed upon amount for one visit. I've dealt with P.I.'s before and although the general rule of thumb is that you "have to push them" to get things done, this was not the case with TriStar as they got things done on their own schedule but as noted, expeditiously. Would recommend.
Hannah Martin
Mar 14, 2016
I have known Bruce and his team at Tristar Investigation for a few years, and recently had the pleasure of working with them for a process service case here in Los Angeles, where someone was trying to evade service with every old trick in the book, even pretending to be out of town when they weren't. I knew only a private investigator could help since they are able to do a stakeout with surveillance and work during odd hours around the clock.

After getting in touch with them online, Kellie called me back right away to explain my options and discuss my needs. If I ever need a personal investigator's services again in the future, Tristar will be first on my list - they're the best if you need a quick, reliable PI in California!
Tony T.
Aug 06, 2015
I was very happy with the service of Tristar, I had the info I requested in less time than anticipated. I would 100% recommend this service.
Catherine M.
May 16, 2015
My Los Angeles personal injury law firm regularly needs asset checks conducted on defendants, and needs to track down a defendant's address for service of process. We've used Tristar Investigation for years. They offer all the services that a personal injury firm needs, including getting witness statements and doing background checks. Pricing is very reasonable. Most importantly, they are prompt, dependable and quick to respond if we need status updates. I definitely recommend Tristar.
JayCee C.
Jun 29, 2012
I used tristar investigations to follow an employee who had alledged she had a back injury that was caused at her place of work, my home. They were prompt, professional and on par with the usual hourly rates of their peers. Their follow up service and record keeping is second to none. I'd recommend them, from a house manager/& home owner