Welcome to Capstone Security and Investigations LLC.

 Capstone Security and Investigations LLC, is based in Washington State and provides armed and unarmed security and private investigation services. We are 100% minority owned, veteran owned and work hard to keep our communities and businesses safe. Additionally, we have a team of certified Trainers in a variety of topics to ensure our teams have the skills and certifications to provide the peace of mind that our clients deserve.
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Armed and Unarmed Security

Private Investigations

Capstone provides uniformed and plainclothes teams that are well trained, fully licensed, and certified in key areas to ensure high quality service to our clients. We offer protection, patrol, and guard services for a variety of needs ranging from property protection, all the way to crowd patrol for large venues and events. We have the skills and experience to meet a wide range of Security needs.

24/7 Live Support

There is always a direct line of contact to a supervisor while Capstone employees are on site or actively with clients.  ​

Capstone provides licensed armed and unarmed Private Investigators. We conduct surveillance, provide bodyguard services, witness and asset location, criminal law investigations,Human trafficking and missing persons investigations and we strive to meet the needs and exceed the expectations of our clients.
Our team of Private Investigators is highly experienced, reliable and trustworthy. 

Training and Certification Courses

We offer a variety of training and certification courses, including Washington Unarmed Security Guard certification training as well as Unarmed Private Investigator certification training.
To see more about our courses and training, refer to our services page. 

"Integrity is built on honesty, and
honesty is the foundation
​of a strong relationship"

CSI covers the entire state of Washington. 

                                               Capstone is an MBE certificate holder.