2255 Glades Road Suite 324A Boca Raton, FL 33431
Florida Agency License: A1300208


About Us

Comprehensive Investigative Solutions, LLC. was established by former narcotics detectives with more than forty years of experience in the law enforcement industry. John Sinks and CIS Team of Investigators spent their entire careers serving and protecting the citizens of South Florida.

Boca Raton Private Investigation Agency

During their tenure in law enforcement they were assigned to many different positions throughout the agency. They served on road patrol, as field training officers training new recruits, and as investigators handling many different facets of crimes. They also assisted in complex investigations such as homicides. They have served in a street level narcotics unit, often times serving in an undercover capacity. A majority of the time they spent in the narcotics unit was conducting stationary and mobile surveillance often by covert means.

They are certified police instructors and have attended numerous schools during their tenure as detectives to better themselves and their careers. These courses include Interview and Interrogation Techniques, Undercover Operations, Surveillance Techniques, Drug Enforcement Agency School, and the Institute of Police Technology in Jacksonville, Florida.

Thanks to their time spent working as detectives they have gained experience and knowledge that far surpasses many investigators in the private investigation industry today.

Comprehensive Investigative Solutions and staff pride themselves on their core principles of honesty, integrity, respect, and teamwork and are the keys to their success. These are the fundamental values their company was founded on and what they truly believe in.


CIS has the skills and resources available to provide customized and comprehensive investigative solutions for today’s busy world.  We have been in business since 2013 and have extensive experience in investigative techniques and tactics.  With over 40 years combined experience from law enforcement, military, and federal government we bring our customers a wealth of knowledge and professional results that are second to none.


Resourceful and results oriented professionals with keen observation and reporting skills with specialized knowledge, and achievement in the area of private investigation.  Proven attention to detail, follow through and problem solving ability.  Experienced and disciplined professionals with in depth knowledge of surveillance principles and recognized for keen ability to perform within pressured environments.


Bryan Matthews (President/Operations Manager/Investigator)

Retired from the United States Navy recently after 20 years of honorable and highly decorated service.  His first nine years spent as a Hospital Corpsman where he was attached to numerous Special Operation units for the United States Marine Corps, and the last 11 years as a Navy Cryptologic Technician – Collections, Special Warfare Operator.

John Sinks (Vice President-Operations/Lead Investigator)

Results-oriented professional with more than twenty eight years of law enforcement / security experience. Expertise in collaborating with law enforcement officials to develop and promote crime-prevention initiatives, implement theft-reduction procedures, and educate loss prevention professionals by providing knowledge and awareness.

Daniel R. Lindsey
Retired after serving 26.5 years in law enforcement. Daniel’s career in law enforcement started in 1989 with the Pompano Beach Police Department. Mr. Lindsey worked as a road patrol officer then as a training officer, for new recruits, to teach new hires on how to be an effective law enforcement officer.


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