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Blackstone Investigations Group, B.I.G.

Blackstone Investigations Group of Mount Laurel, New Jersey offers premier private investigation services across the entire state of New Jersey. Our agency of professional and discreet private investigators provide investigative and surveillance services for private clients, corporate clients, law firms and attorneys. We have years of experience handling a variety of sensitive cases, including cohabitation and alimony, infidelity/cheating spouses, child custody cases, workers comp and insurance fraud investigations and personal injury cases. At Blackstone Investigations Group, our teams of experienced investigators provide quick, effective, and confidential solutions to uncover the information you need in a timely manner. The office is open 24/7 so don’t hesitate to call us now. Feel free to check out the entire site to learn more about the owner and the services we provide.

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All Blackstone Investigations Group private investigators and subcontractors are fully trained, licensed, and in compliance with local, state, and federal laws to ensure our clients receive the highest quality services.

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  • “I am proud to say that I have recently begun using the professional services of Blackstone Investigations Group for several family matter type cases and have been thrilled with the results.  After being in business for many years, I fully understand the importance and value in using professional investigators, but unfortunately, many of the investigators that I have utilized in the past have not satisfied or met the level of professional that I expected. Dave is sincere, tenacious and is truly dedicated to customer satisfaction and taking care of my clients. Whenever the need arises for a Private Investigator, the only name that I consider for my clients now is Dave Ollivier and the team at Blackstone Investigations Group.  I have no reservations endorsing Dave and his firm for any type of investigative assignment!”

    - Diane Bowman, Esq. Bowman Law Offices Trenton, NJ 2-15-19

  • “Mr. Ollivier, I cannot thank you and your team enough. Your professionalism is without question. I have used many investigative firms in the past in business when I need information regarding who I am doing business with. I have never used such a firm for personal matters and I must admit that your conduct goes so over and above what others can or are able to do. I walk from this knowing the following: That you are incredible and that I have actually made a new friend who cares about and understands feelings… This above anything else makes this difficult situation easier and makes me smile… Your advice has been invaluable and only through the pleasure of meeting you to say the words of thank you can I truly express my gratitude.”

    - John S. Medford, NJ 1-18-19

  • “I wanted to write to express my complete satisfaction with the service provided by Dave and the team at Blackstone Investigations Group. We needed to find out the truth about our opponents activities, and Blackstone gave us the answers.  I was extremely impressed with their professionalism and the short turnaround time in which they were able to obtain the information we requested.  If the need ever arises I would not hesitate to call on them again for their services.  I also will not hesitate to recommend your firm to any of our clients who may be in need of your services.  Once again, thank you very much for an excellent job and your professionalism.”

    - Joan D. Esq. Mullica Hill, NJ 12-17-18

  • “Dave, you are the best! Thanks so much for working with me in the most troubling of times. For a long time, my husband and I worried about the friends our daughter was really spending her time with and whether or not she was using drugs. The information you provided was critical in helping us find out the truth and begin mending the broken relationship and trust issues we have with her. You have helped bring our family back together!”

    - Jessica R. Marlton, NJ 9-23-18

  • “It is rare that you find a professional of such stature that maintains his integrity, honesty, and privacy, I would recommend Mr. Ollivier and his firm to anyone in my family and amongst my friends as well as anyone else who is in need of any assistance from an all-purpose firm. Mr. Ollivier, will not simply investigate matters for you, he will take care of your interests in a manner that is very rare in today’s society.”

    - Bridgette O. Cape may, NJ 9-4-18

  • “It is with great pleasure that I write this recommendation for your services. When my son had run away from home last summer, I feared I would not see him again. Thanks to you and your work, we were able to reunite within days and work out whatever issues had surfaced.”

    - William E. Red Bank, NJ 5-3-18

  • “Dear Dave, I’m so glad I found your company and used your services to run my boyfriend’s background and criminal history check. My family members and friends were suspicious of him, but I didn’t see it. Thankfully, your investigators found out information about him that I didn’t even know existed and helped me through a tough time. Needless to say, I broke up with him and am now much happier and safer.”

    - Emily J. Vineland, NJ 4-12-18

  • “Dear Dave, I wanted to let you and your staff know how truly grateful I am for the wonderful, professional and caring services your company provided during one of the most difficult times in my life.  Going through a divorce in itself is very tough, but then to find out your ex-wife has been living with her new partner while I’m paying her alimony every month made things even worse! With the evidence you provided, my attorney was successful in getting my alimony eliminated! You’re the BEST! Thanks again for caring about my situation and helping me get the proof I needed.”

    - Jonathan R. Esq. Cherry Hill, NJ 2-21-18

  • ”Hiring Dave and his team was the best thing we could ever do to find out what our teenage son was actually doing. Dave found out all the information we needed to know in a very short period of time. Thanks for doing such a great job Dave!”


    - Susan D. Hamilton Twp, NJ 11-2-17

  • ”After speaking with several other investigators, I felt the most comfortable working with Dave and his team of investigators. The situation was already stressful enough but Dave made me feel comfortable and gave me the peace of mind I needed to know that someone was actually looking out for me. He worked within my budget and got me more evidence and proof that my suspicions were right; more than I could possibly imagine. Thanks Dave for making a difficult situation a little bit better! I will highly recommend your services.”

    - Stan J. Ocean City, NJ 04-12-17

  • “Dear Dave, just felt the need to say “Thanks” for catching the employee who lied about being injured on the job and work and then trying to collect workers comp pay while working another job. It’s unbelievable what some people will do to work the system to their advantage.

    - Stephen Y. Toms River, NJ 2-6-17

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