Who We Are:

Professional TSCM / Cyber TSCM Service Provider & TSCM Equipment Supplier

ComSec LLC is a leading TSCM / Cyber TSCM services company in the USA, and globally. We are renowned for our expertise in detecting electronic eavesdropping threats and vulnerabilities, and restoring privacy. We serve government, military, corporations, non-profits, dignitaries, celebrities, executives, HNWIs, and other high risk individuals in the USA, and globally. Our commercial customers include Fortune 100 businesses to small businesses. Our residential clients include business owners, executives and others who believe their privacy has been compromised.

Leaders & Visionaries

Our founder and President/CEO, JD LeaSure, is the visionary and pioneer of the field of practice known as Cyber TSCM. ComSec LLC retains its advantage in the Cyber TSCM field due to its relentless pursuit of the best equipment available to detect current and emerging threats. We also constantly study changes in vulnerabilities and exploits that can be used for electronic eavesdropping purposes. Due to ComSec LLC’s pursuit of excellence and its expertise in the detection of electronic eavesdropping threats and exploits, ComSec LLC was approached by government personnel to provide TSCM equipment. This launched ComSec LLC into the field of TSCM equipment development, kitting and supply for government, military, TSCM practitioners and corporations.

Our Mission

To provide technologically advanced TSCM / Cyber TSCM services, TSCM equipment and TSCM equipment training. Our mission is to empower our clients with the intelligence necessary to protect their valuable, sensitive and proprietary information.

What We Do:

We use a multi-faceted counterespionage approach to our TSCM / Cyber TSCM Services. We use HUMINT (Human Intelligence), OSINT (Open Source Intelligence) vulnerability assessments, TSCM and cyber technical surveillance countermeasures (Cyber TSCM) to provide a thorough assessment of your risk. The assessments identify human, technical and electronic threats. Our goal is to detect the threats and vulnerabilities, then restore your privacy and peace of mind.

The Operator Kit TSCM EquipmentTSCM equipment we supply provides a technological advantage in a field ready, mobile solution. And, we only sell TSCM equipment products that our experts have qualified for their technological advantage(s). Also, we only provide equipment solutions that our experts trust enough to use in performance of our services. Whether you choose our  TSCM / Cyber TSCM Services, or you purchase our TSCM equipment, you are receiving a an effective solution.

Our Services Customers:

We serve businesses and individuals in the USA nationwide and globally. Our corporate clients are Fortune 100 companies to small businesses. We also serve non-profits and government agencies. Our residential clients are executives, celebrities and others who suspect a surveillance threat.

We also partner with organizations who source services for their customers. If you represent a security consulting firm, private investigative firm, government contractor, technology development company, law firm, embassy security firm, we work with you to serve your clients.

We are top rated by our clients, and have earned an A+ BBB rating. Clients appreciate our dedication to excellence. We are also discreet and respect your confidentiality. Read our Customer Testimonials

Interested in hiring ComSec? Learn more here

Our TSCM Equipment Clients:

Our clients include government, military, TSCM practitioners and corporations who use the equipment in SIGINT, ELINT or electronic warfare applications, or to conduct TSCM / Cyber TSCM surveys. We provide a variety of solutions that are mobile, field ready and proven effective for signal analysis applications. Some TSCM equipment clients select our solutions for the associated brands, such as Kestrel TSCM Pro Software or JJN Digital TSCM equipment. Other clients choose the equipment  based on our expertise. Yet other clients choose our TSCM products for the convenience of a fully integrated field ready solution, such as our Kestrel Surface RF Locator kits , the Predator RF Hunter or the Operator TSCM Sweep Kit.

Our Leadership:

The driving force behind ComSec LLC is J.D. LeaSure, our President/CEO. His extensive counterespionage, counterterrorism and counterintelligence knowledge is invaluable to the company and the clients we serve. His distinguished career in these fields spans more than four decades,, and includes both work in the USA, and in over 62 countries globally.

Learn more about J.D. LeaSure and the ComSec Team.

J.D. is also the Director of The Espionage Research Institute International (ERII), and a full member of the Technical Surveillance Counter Measures Institute (TSCMi). He is also an active contributor to the world of counterintelligence and technical surveillance countermeasures. Please view our Industry Affiliations to learn more.

Significant milestones in ComSec LLC’s history follow:


  • ComSec LLC was founded by J.D. LeaSure, its President/CEO, to address the need for an expert Technical Surveillance Countermeasures (TSCM) service provider in the local Hampton Roads, Virginia area.
  • Demand for global counterespionage services continued to grow, and ComSec LLC met this demand by expanding its service area to USA nationwide.
  • At the request of government personnel (due to J.D. LeaSure’s depth of knowledge of technical surveillance threats), ComSec LLC began developing and supplying mobile, field ready TSCM sweep equipment to government, military, law enforcement and corporations.
  • ComSec LLC expanded its service area to globally as a result of demand for our expertise.
  • ComSec LLC uncovered a nation stated sponsored attack in east Asia and southeast Asia perpetrated against a US technology company. This was the first known instance of the use of the GSM cellular network to steal intellectual property from a corporate network.
  • J.D. LeaSure pioneered the field of practice in the space between TSCM and cybersecurity that he called “Cyber TSCM.”
  • ComSec LLC became the first company to offer TSCM/Cyber TSCM services to address traditional eavesdropping devices, as well as cyber eavesdropping devices and hybrid eavesdropping devices.
  • ComSec LLC is appointed the exclusive distribution partner for Professional Development TSCM Group Inc.’s KESTREL TSCM Professional Software for the United States of America (USA) including all states and territories, representing commercial interests, US Government, and third-party Military Contractor Sales.
  • ComSec LLC opens a satellite office in Washington, DC to serve government, military, corporations, non-profits, dignitaries and executives in the greater Washington, DC area.
  • ComSec LLC becomes the exclusive commercial provider of IMSI Catcher Detection Services using the OverWatch system. This addition to ComSec LLC’s service offerings provides detection capabilities for the growing threat posed by the use of illicit IMSI catchers to syphon information on cellular devices.
  • ComSec LLC receives our largest single order for ComSec Kestrel Surface RF Locator 2 Kits, which was in excess of $1.3 million. Several additional orders of the ComSec Kestrel Surface RF Locator Kits and ComSec Kestrel Surface RF Locator 2 Kits resulted in annual kit sales of over $2.2 million dollars.
  • ComSec LLC was named the exclusive North American supplier of the JJN Digital Handheld TSCM equipment.
  • ComSec LLC added Open Source Intelligence (OSINT) investigations to our service offerings to address corporate and executive vulnerabilities through clandestine and unintentional open source/Internet disclosures.


  • ComSec LLC expanded its product offerings and was named the exclusive North American supplier of the QCC Sentinel and the Phantom Passive BTS Hunter.
  • ComSec LLC expanded its forensics services to include computer forensics services.

Meet Our Team

J.D. LeaSure, M.Sc.Eng

Founder, President/CEO

Lisa LeaSure

Director of Operations - VA Beach Headquarters
Entrepreneur, Strategic Alliances

Frank Rose

ComSec Teammate - Northern VA | DC Metro Office
TSCM / Cyber TSCM Investigator

Cyber Guy

ComSec Cyber SOC
Cyber Incident Analysis | Cyber TSCM Technician
Technical Surveillance Countermeasures | TSCM Equipment

ComSec Teammate

Puerto Rico Office
TSCM / Cyber TSCM Specialist
Len Gonzales ComSec OSINT

Len Gonzales

ComSec Teammate - VA Beach
Open Source Intelligence (OSINT) Specialist

Michael Goode

ComSec Teammate - VA Beach
TSCM / Cyber TSCM Tech
What wonderful service, and such peace of mind. I truly appreciate it.

Hired ComSec for Residential TSCM/Cyber TSCM Services

Jill, VA, Residential Client
ComSec's Team are "Best-in-Class" and will deliver top-quality performance & customer-service...In my opinion, especially when it come to counter-espionage services you can lean-on & trust, ComSec has no peers.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Joseph S., President, Corporate Client
I can’t tell you how thankful I am to have done business with you. Your services are worth every penny. The peace of mind is immeasurable!

Hired ComSec for Residential TSCM/Cyber TSCM Services

PAUL J., AZ, Residential Client
It was a pleasure to meet and work with Frank. We'll definitely use ComSec again should we need additional services.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Pam, CA, Corporate Client
Thank you all again for your assistance in this matter. It has been a pleasure working with Frank, John G. and you.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Paul, FL, Corporate Client
This company is the real deal. I had a situation where it was questionable if I was being bugged. I was referred to JD and his company. In speaking with JD over the phone for the initial discussion he was clear, direct, and professional. The end result was my concerns were alleviated and I could not be happier.

Hired ComSec for Residential TSCM/Cyber TSCM Services

MS, MA, Residential Client
We're so glad we hired ComSec. Thanks for hunting down the issue and helping correct the problems.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Steve, OH, Corporate Client
Thank so much for the help! The peace of mind is so valuable.

Hired ComSec for Residential TSCM/Cyber TSCM Services

Mark, CO, Home Owner
Everyone we dealt with at ComSec was knowledge and helpful. We definitely hired the right company.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

A.Z., NYC, Corporate Client
I appreciate J.D’s help with ensuring the security of my home and belongings. It was great being informed of potential security risks and discussing the electronic threats that we face today. Thanks again!

Hired ComSec for Residential TSCM/Cyber TSCM Services

Paul, WV, Residential Client
J.D., your technical expertise and equipment are very impressive. I'm very confident in your services and appreciate the attention I was given and all of the help.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Adrien, CA, Tech Executive
Your team was responsive to our needs on such short notice. We will definitely recommend ComSec to colleagues in need.

Hired ComSec for Pre-Meeting TSCM/Cyber TSCM Services

Paul, Washington DC, Government Contractor
J.D.'s expertise and knowledge set him apart in the industry. We would not trust anyone else with performing TSCM/Cyber TSCM services of our aircraft!

Hired ComSec for Aircraft TSCM/Cyber TSCM Services

Howard, TX, Corporate Client
You did such a great job the last time, I'll be using your services for all of my clients.

Hired ComSec for Cellphone Forensics Services

Dave, TX, Corporate Client
ComSec has been performing pre-meeting sweep services and in-conference monitoring for our corporate events for several years. We could not be more pleased with J.D.'s expertise, the level of services provided and the overall responsiveness of the ComSec team. Great Job!

Hired ComSec for Meeting TSCM / Cyber TSCM Services

Paula, MD, Corporate Client
The level of service and the technical knowledge of your team far exceeded our expectations. We will definitely be contacting ComSec for services in the future.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Ted, NYC, Corporate Client
I am deeply thankful for the peace of mind your service has provided me with.

Hired ComSec for Residential TSCM / Cyber TSCM Services

Paula, WA, Residential Client
Thanks a million to you and Lisa for taking on this job on such short notice. Trust me, you have secured a spot on our very short list of companies to call when we find ourselves in need of such services. Thanks again for the swift response to our very urgent call for assistance.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Corporate Client, Fortune 500 Company
Thank you very much for the quick turnaround. Frank did a great job and was very professional. We appreciate your help in giving us peace of mind with our concerns. The whole process working with you all was very efficient, professional and organized. We will definitely call you in the future if we need additional services. Thanks again!

Hired ComSec for Corporate TSCM/Cyber TSCM Services

PW, MD, Corporate Client
J.D. & Brent were great to work with! We will definitely use your services again.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

A.R., Corporate Client, District of Columbia
I was very satisfied with the service provided, your availability, your responsiveness and the overall experience. I will definitely recommend your company to friends and colleagues.

Hired ComSec for Residential TSCM/Cyber TSCM Services

KH, MD, Residential Client
Very much appreciate your help in moving this logistically so quickly! We will definitely recommend you all to our friends and partners.

Hired ComSec for Corporate TSCM / Cyber TSCM Services

Michael, Washington DC, Corporate Client
What an amazing company and individual who really cares and wants to help his customers i thank you JD!

Hired ComSec for Corporate TSCM/Cyber TSCM Services

Corporate Client, CA
I was assured that I was getting an inspection of quality and expertise, thanks to J.D’s explanation of his equipment and the services provided.

Hired ComSec for Residential TSCM/Cyber TSCM Services

Pam, IL, Residential Client
Thanks for sending the reports through JD. We appreciate the expert tscm services you and your team provided. V/r, SJ

Hired ComSec for Corporate TSCM/Cyber TSCM Services

SJ, Washington DC, Corporate Client
Good morning J.D., I have successfully retrieved the report and downloaded the contents of the folder. I want you to know that you have put my mind at easy and given me the freedom to carry on with my daily activities minus the worry, stress, and fear. I greatly appreciate your integrity! Good luck on all of your future endeavors! Warmest Regards, R.A.

Hired ComSec for Residential TSCM/Cyber TSCM Services

RA, TX, Residential Client
I came across J.D. when I was managing a large-scale cyber incident response for a F500 company, who had had their computer networks breached by Chinese nationals. The investigation led us throughout the world, with on-site inspections in Beijing, Shanghai, Singapore, Mumbai, Mangalore and several locations in the United States. J.D. proved himself a consummate professional during that response, doing what he said, when he said he would do it, on or before deadline, at cost, as promised. I have subsequently engaged J.D. in a personal protection detail to clean a residence of a high-profile individual who was the subject of death threats and who was feeling vulnerable. J.D.’s work ensured the person was assured of their privacy and attained a peace of mind they had not felt in some time. Again, as promised, on time, on budget. I recommend J.D. wholeheartedly and without reservation for TSCM work.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

NS, TX, Corporate Client
J.D. Leasure’s performance in the field of TSCM/Cyber TSCM is outstanding in every respect. I’ve interacted with and worked around J.D. Leasure for a number of years, during that time I’ve know his work to be of the highest quality and integrity. His experience in the field of Technical Countermeasures is extensive (i.e., just read his BIO) and consistently exceeds the expectations of the clients I have forwarded to him. J.D. is smart, methodical in his approach and he runs a lean company so if you are interested in protecting your intellectual property or have a need for his services give Mr. Leasure and his team at ComSec a call.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

MG, VA, Corporate Client
J. D., I just wanted you to know that I truly trust your expertise and feel honored that you took my assignment. Your professionalism and ability to get to the bottom of the situation quickly exceeded my expectations. Your thorough sweep and suggestions were a vital part of my peace, and for that, I am most grateful. Thanks again
Best regards, JC

Hired ComSec for Residential TSCM/Cyber TSCM Services

JC, AZ, Residential Client
Really enjoyed meeting the team and I think everything worked out great for my company’s needs.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

AH, VA, Corporate Client
J.D. and Johnny are Awesome! They are both knowledgeable, professional and a pleasure to work with! Thank you and Johnny for all of your hard work! It was definitely a pleasure!

Hired ComSec for Multiple Corporate TSCM/ Cyber TSCM Services

ARS – San Antonio, TX
ComSec is responsive, thorough, and knowledgeable.

Hired ComSec for Residential TSCM/Cyber TSCM Services

You and your team did a fantastic job JD! Keep up the good work!

Hired ComSec for Corporate TSCM/Cyber TSCM Services

M.D.S., MI, Corporate Client

Hired ComSec for Corporate TSCM/Cyber TSCM Services

M.K.L., New York, NY, Fortune 500 Client
I feel that the service that was provided was excellent. When dealing with a situation that includes potential privacy breech, you need someone that firstly, knows what they are doing and secondly that listens and responds to each concern. I feel that both objectives were met with ComSec. Thank you for the help.

Hired ComSec for Residential TSCM/Cyber TSCM Services

“Heather”, Residential Client
The response and attitude of your team was outstanding. Will definitely use ComSec again!

Hired ComSec for Corporate TSCM / Cyber TSCM Services

“William”, Fortune 500 Corporation
Working with JD was a great experience. He was very knowledgeable, courteous and timely. A++!

Hired ComSec for Corporate TSCM/Cyber TSCM Services

“Barret”, Fortune 500 Corporation
J.D. is of highest moral aptitude, character and intelligence that I have had the pleasure to work with for some time. I hold J.D.’s opinions at the highest esteem and respect. From the vast knowledge that he possesses, I consider Mr.LeaSure’s counterespionage expertise an asset in any business, diplomatic, intelligence or security venture on the global scale invaluable.

Government of Israel

Jacob Goldberg
J.D.’s team responded to a highly critical situation within hours of the first contact. Upon arrival at the site – the project initiated immediately and resulted in an extremely satisfied client that subsequently requested J.D.’s team on followup engagements.

Hired ComSec for Multiple TSCM/Cyber TSCM Services

Jarrett Kolthoff, President/CEO SpearTip, LLC
Mr. LeaSure's extraordinary field experience for the past several decades helps to ensure both an accurate and successful meeting. His vast knowledge and equipment makes him the best in his field. I am so excited to describe my experience with ComSec and assure all of you what great success I had hiring him. The best decision I have made. Don’t leave any doubt if, you have suspicions BRAVO

President of Osprey Spill Control (OSC)

Mary Meyer
I first spoke with J.D. after discovering what appeared to be a battery operated electronic listening device hidden in my office. J.D. counseled me on the precautionary steps that I should immediately take while he worked to identify the device. Within an hour of emailing a photo to J.D., he responded with an exact identification of the device, including source information and additional go-forward advice.This instance turned out to be a harmless office prank that did not involve an actual listening device. The person responsible was identified and completely disclosed their intentions. It is reassuring to know that had this been a real threat to the security of confidential information, J.D. was there to identify and remove the threat. If you are looking for a true professional who takes your concerns seriously, I highly recommend contacting J.D. I surely will.

Baxter Healthcare Corporation

Perry Crumbaker
Director of Business Operations
Spillane Associates has had the pleasure of using the technical services of J.D. in the field of TSCM (Technical Surveillance Counter Measures) for our high-profile client. Aside from the extremely high quality of work that was provided, J.D. worked around a challenging client schedule to accomplish the TSCM. Above all, J.D. made the client comfortable and secure while maintaining the level of service expected from Spillane Associates. I would not hesitate to use the proven services of J.D. LeaSure for any of our clients in the future.

Investigator at NJ Department of Banking & Insurance

Robert Spillane
There is no other way to describe J.D., other than he is the quintessential consummate professional. I use his firm frequently for my high profile clients

Hired ComSec for Multiple TSCM/Cyber TSCM Services

Owner, Samuel Yount Investigations, Inc.
I have personally and professionally known JD for well over 20 years. JD has always presented himself in the most professional manner. Serving in Special Forces and requiring equipment of the highest standard has always been our benchmark of operation and settle for nothing less. JD consistently provided our unit with the highest grade, cutting edge technology products on the market. I strongly recommend anyone looking for the highest professional TSCM service, from some one who truly has the client’s best interest at hand. Understanding the needs of our current security corporate culture climate, where confidentially, timeliness, and accuracy is a must, anyone looking for these specific capabilities should speak with JD about his line of cutting edge TSCM services that are truly second to none. Brent Delorier CWO (R) US Army, Special Forces

  • Brent Delorier, CWO (R), US Army, Special Forces
  • Brent Delorier, Associate
  • Booz Allen Hamilton, Virginia
  • Testimonial, US Army, Special Forces

President/CEO at Jäger Group LLC

Brent Delorier
I have known J.D. for a number of years now. J.D’s expertise in the areas of TSCM, Counterespionage and espionage detection methods is, by far, the most detailed and professional that I have seen in the industry. His skills and professional services come with my highest recommendation!

Hired ComSec for Multiple TSCM/Cyber TSCM Services

Kristopher Bleich, EnCE, C|EH
Director of Forensic Services, SpearTip LLC
J.D., so sorry for my late response. I did receive your report and have taken your recommendations to my IT manager for further action. Thank you for your professional service and your quick availability. Your work has allowed many of us to rest easier. Thank you for everything.
Top qualities: Expert, On Time, High Integrity

Hired ComSec for Residential TSCM/Cyber TSCM Services

“Jenny” PA, USA
Thank you, J.D. I now know who to go to for future needs and who to recommend to my associates – yes, it’s you!
Top qualities: Great Results, Expert, High Integrity

Hired ComSec for TSCM / Cyber TSCM Services

“Robert”, Washington DC
JD, Thanks for the detailed report, and for the thorough service. I would use your service again, and would certainly recommend you to others.

Hired ComSec for Residential TSCM/Cyber TSCM Services

“Todd”, Knoxville, KY
J.D. Your team did an excellent job at our facility. Truly an exceptional team and service! V/r

Hired ComSec for Corporate TSCM/Cyber TSCM Services

“J.R.” D.C., Corporate Client
Great team of experts who are proficient and knowledgeable in this business. It was a pleasure working with ComSec LLC!

Hired ComSec for Corporate TSCM/Cyber TSCM Services

“S.S.”, MD, Corporate Client
We are very satisfied, and happy with the personalized service and availability of ComSec to suit our customized needs.

Hired ComSec for Corporate TSCM/Cyber TSCM Services

“Fortune 100 Corporation”
Your organization is one of the most professional and knowledgeable in the industry, that we have had the pleasure to work with...

Hired ComSec for Multiple TSCM/Cyber TSCM Services

“John”, U.S. Defense Contractor
The response and attitude of your team was outstanding. Will definitely use ComSec again.

Hired ComSec for Multiple Corporate TSCM / Cyber TSCM Services

“Bill”, Fortune 500 Corporation
Thank you! I appreciate how fast you were able to get here and help me!

Hired ComSec for Corporate TSCM / Cyber TSCM Services

“Carrie”, Small Business Owner