Call Us : (856) 885-4319

Welcome to

Blackstone Investigations Group, LLC (BIG.)

Blackstone Investigations Group, LLC 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, LLC 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. CALL US TODAY !

Don’t Forget, We’ve Got Your Back!

Learn more

All Blackstone Investigations Group LLC 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.

Free Consultation

The investigation experts at B.I.G. have your back – call us today for a confidential consultation.


  • Dave, as you know, your kindness and genuine concern for my case was what led to me retaining your services. The level of technical skills and knowledge your forensics team displayed was great! I knew my boyfriend was cheating and using our home computer to chat with his new girlfriend, I just couldn’t prove it. Thanks for recovering all the deleted date he thought was gone forever.


  • I recently hired Blackstone to find assets and bank accounts that my soon to be ex-husband was hiding from me. Thanks to Dave and his team, I learned that he had been stashing money in several accounts that I knew nothing about. My attorney was able to use this newly found information and present it in court. In the end, I got what I deserved thanks to Dave and his diligent work. I would highly recommend his services to anyone.


  • Dear Dave, I wanted to say thanks for confirming that my teenage son was not being properly cared for while in the custody of my ex-wife during her shared custody parenting time.  As suspected, her drug and alcohol abuse were an ongoing issue, and her new boyfriend was verbally abusing my son. Thanks to the video evidence you obtained, my attorney was able to get me full custody due to the dangerous conditions my son was forced to deal with. Your time and patience is much appreciated!


  • My husband and I became victims of fraud to people we trusted and adored. We welcomed them into our lives and our very successful health care business. Little did we know, they had successfully hacked into our business computers and were stealing a vast amount of client’s personal information. After hiring local “forensic investigators”, we contacted Dave in New Jersey and explained the situation. He was exceedingly kind, considerate, and genuinely concerned for us. The decision was made to send our hard drives and other electronic equipment to Dave so they could conduct an in-depth forensic exam on all the devices. Several weeks later, Dave provided us with a vast amount of forensic information that our attorney needed. Thanks, Dave, for all your hard work.


  • To Dave O. and the awesome team at Blackstone Investigations in Mount Laurel, New Jersey. I am so glad I chose you and your firm to conduct surveillance on my ex-wife so that I could finally prove she was living with her new boyfriend while continuing to take my monthly alimony payment. Your genuine concern, guidance through the process, and kindness truly had a major impact on me and the case. Thanks to you, my attorney and I were successful at getting my alimony terminated! The amount of evidence you obtained through difficult conditions over the course of a few months was spectacular and much appreciated. I will highly recommend you services!


  • Many thanks to you and your team for helping my family and I locate my missing brother. We really appreciate all that you did to make this dream become a reality!


  • My firm hired Blackstone’s IT team to conduct a social media investigation on several employees who were allegedly posting negative comments and reviews about our company all over social media platforms. Within just a few days, Dave was able to retrieve both current and previously deleted posting from several fake social media accounts that were set up by the employees. Thanks to Dave we were able to discipline the employees without fear of repercussions. I would strongly recommend Dave and his team for any social media cases.

    - Barbara W. Haddonfield, NJ 9-12-20 – SOCIAL MEDIA INVESTIGATION

  • Dear Dave,

    I can’t even begin to tell you how special you truly are. The kindness, compassion and the amount of patience shown towards my husband and I during this troubling time was absolutely amazing! When you and your team took on my case involving the custody of my grandson, I had no idea how difficult the other parties involved would become. My grandson was in danger and living in a very unhealthy environment. Your tenacity during the investigation, and the way your team coordinated their efforts was top notch! Thanks to you, my grandson is now living with us full time and is finally safe! I will highly recommend your services to anyone who is dealing with a child custody case. Well done Dave!

    - Janet C. Hammonton, NJ 9-1-2020 – TEEN TROUBLE CASE

  • As you know, I suspected that my fiance was having an affair during the time we were putting wedding plans together. I’m so glad I contacted you and hired your firm to conduct in depth surveillance on my fiance in order to uncover the truth about his infidelity. Everything appeared fine on the surface, but I now know he was just going through the motions. I sincerely appreciate your effort, your positive uplifting attitude towards me and the situation in general, and most importantly, your dedication to finding out the answers I needed and deserved. You save me a ton of aggravation…and I just wanted to say Thank You.

    - Mary H. Short Hills, NJ 8-23-20 – PRE-MARITAL INVESTIGATION

  • As a professional athlete, I typically have a hard time trusting and confiding in anyone, especially when it involves personal matter of this nature. After speaking with numerous private investigation firms, I spoke with Dave, and I can honestly say that from the moment we spoke on the phone I was comfortable with him, his background, his knowledge in the industry and his drive to satisfy his clients. He explained the pricing and the company retainer agreement, how the investigative/surveillance the process works, his video equipment, and the tactics he and his team utilize to document evidence. Needless to say, I was very impressed and hired him on the spot! The job is now completed, I am 100% satisfied and would highly recommend Dave and his team to anyone looking to hire a top notch private investigator! Thanks Dave.


  • Dave and Team,

    I just wanted to drop you guys a quick “Thank You” for all your hard work and effort on my case. When I found out my ex wife had been living with her new boyfriend for over two years I almost lost it. My attorney suggested hiring a Private Investigator so I began my search, and after speaking with 5 different companies, I selected Blackstone Investigations, and I’m sure glad I did. You took my case personally and didn’t treat me as if I was “just another job”, and that goes along way with people when they are dealing with very strenuous circumstances. Our initial phone made feel more at ease after you took the time to explain the process of how things work. Once the judge reviewed the mountain of damning evidence you and your team provided, alimony was immediately stopped! Please say “Thanks” to the guys, it was a real pleasure working with them. Feel free to use me as a referral anytime!

    - Paul T. Rockaway, NJ 2-23-2020 – COHABITATION INVESTIGATION

  • Hi Dave. I just wanted to reach out and say “Thanks” for all your hard work and genuine concern for my case involving child support payments. After speaking with you on the phone, I knew you were the guy for the job! Thanks to you and your professional team, I was able to prove in court that my two sons WERE NOT full time students therefore allowing me stop paying huge amounts of child support that wasn’t required by law. You saved me a ton of money and I am eternally grateful to you!


  • I own a property management company in South Jersey, and have recently contracted with Blackstone Investigations Group, LLC to conduct in depth background checks on all of our new tenants wishing to move into one of our communities. Dave’s ability to access database information on applicants that nobody else has access to has proven to be an invaluable tool for us and has saved my firm thousand in legal fees since we now know peoples background information BEFORE they move in. I would highly recommend using Dave and his team for your background check needs.

    - CPM Management, LLC 6-5-19 – BACKGROUND CHECK CASE

  • “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 – COHABITATION INVESTIGATION

  • “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.”


  • “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 – TEEN TROUBLE INVESTIGATION

  • “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 – ELDER ABUSE INVESTIGATION

  • “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 – SKIP TRACE/LOCATE FAMILY MEMBER

  • “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 – PREMARITAL BACKGROUND CHECK

  • “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 – COHABITATION INVESTIGATION

  • ”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 – TEEN TROUBLE INVESTIGATION

  • ”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 – INFIDELITY/CHEATING SPOUSE

  • “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 – EMPLOYEE THEFT INVESTIGATION

  • Marine Corps Veteran