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About ComSec LLC

ComSec LLC is a world-class professional Technical Surveillance Countermeasures, TSCM and Cyber TSCM company serving clients in the US, as well as globally. Our company utilizes detection methodologies and equipment that have been proven superior at identifying eavesdropping devices and exposing surveillance tactics. When you choose ComSec LLC’s professional TSCM / Cyber TSCM services, you can be certain we are equipped and ready to perform an effective, world-class TSCM/Cyber TSCM service. Contact ComSec

  • Corporate TSCM Services

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    Contact ComSec

  • Residential TSCM Surveys

Counterespionage Expertise

J.D. LeaSure, ComSec’s President/CEO, is a Counterespionage Specialist who has been active within the counterintelligence, counterterrorism and TSCM fields for 26 years. He has extensive training, knowledge and experience in the identification of eavesdropping devices, espionage detection methods and the intelligence collection tactics most often employed by perpetrators of electronic espionage. Mr. LeaSure and his team have traveled the globe to provide counterespionage advisory services to businesses, chief executives, law firms, governments and high-profile individuals.
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    ComSec TSCM Services

  • ComSec Team

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    Eavesdropping Detection

Our Services

When your business or residence is under surveillance by an illegal eavesdropper, stopping the exposure quickly is critical. Our experienced team of TSCM, Cyber TSCM and Cyber Counterespionage professionals is ready to assist you. In fact, our specialists can respond to most emergency sweep requirements in less than 24 hours.

Services Options

When you suspect you are the target of illegal eavesdropping, you need…


Bug Sweeps

Could someone be listening or watching you? Absolutely! If you…

Cyber TSCM

Securing Information in an increasingly data driven world is…



Technical Surveillance Countermeasures (TSCM), is the Government …


  • Five Stars

    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.

    NS, TX – 2016
  • Five Stars

    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.

    MG, VA – 2016
  • Five Stars

    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 

    JC, AZ
    Hired Comsec in 2016
  • Five Stars

    Really enjoyed meeting the team and I think everything worked out great for my company’s needs.

    AH, VA
    Hired ComSec for TSCM / Cyber Services in 2016
  • 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!

    ARS – San Antonio,TX
    Hired ComSec for multiple Cyber TSCM Services in 2015
  • Five Stars

    ComSec is responsive, thorough, and knowledgable.”

    PM in DC
    Hired ComSec for Cyber TSCM Services in 2015
  • Five Stars

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

    M.D.S., Michigan (Corporate Client).
    Hired ComSec for Cyber TSCM Services in 2015
  • Five Stars


    M.K.L., New York, NY (Fortune 500 Client).
    Hired ComSec for Cyber TSCM Services in 2015
  • Five Stars

    “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”.

    “Heather”, Residential Client
    Hired ComSec for Cyber TSCM Services in 2015
  • Five Stars

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


    “William”, Fortune 500 Corporation
    Hired ComSec for Cyber TSCM Services in 2014
  • Five Stars

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


    “Barret”, Fortune 500 Corporation
    Hired ComSec for Cyber TSCM Services in 2014
  • Five Stars

    “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”.

    Jacob Goldberg,
    Government of Israel
  • Five Stars

    “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”.


    Jarrett Kolthoff, President/CEO SpearTip, LLC
    Hired ComSec for Cyber TSCM Services in 2010, 2011, 2012, 2013, 2014,2015
  • Five Stars

    “Mr. LeaSures extraordinary field experience for the past several decades helps to ensure both an accurate and sucessful meeting. His vast knowledge and equipment makes him the best in his field. I am so excited to describe my experieince with ComSec and assure all of you what great success I had hiring him. The best decision I have made. Don’t leave any doupt if, you have suspicions BRAVO”

    Mary Meyer,
    President of Osprey Spill Control (OSC)
  • Five Stars

    “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”. Director of Business Operations

    Perry Crumbaker,
    Baxter Healthcare Corporation
  • Five Stars

    “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”.

    Robert Spillane,
    Investigator at NJ Department of Banking & Insurance
  • Five Stars

    “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” Samuel Yount,

    Owner, S. Yount Investigations, Inc.
    Hired ComSec for Cyber TSCM Services in 2010, 2011, 2012, 2013, 2014,2015
  • Five Stars

    “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
    Brent Delorier,
    President/CEO at Jäger Group LLC
  • Five Stars

    “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”! Kristopher Bleich, EnCE, C|EH

    Director of Forensic Services, SpearTip LLC
    Hired ComSec for Cyber TSCM Services in 2010, 2011, 2012, 2013, 2014
  • Five Stars

    “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

    “Jenny” PA, USA
    Hired ComSec for Cyber TSCM Services in 2013
  • Five Stars

    “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

    “Robert” Washington, DC
    Hired ComSec for Cyber TSCM Services in 2013, 2014
  • Five Stars

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

    “Todd” Knoxville, KY USA
    Hired ComSec for Cyber TSCM Services in 2013, 2014
  • Five Stars

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

    “J.R.” D.C., USA
    Hired ComSec for Cyber TSCM Services in 2014
  • Five Stars

    “Great team of experts who are proficient and knowledgeable in this business. It was a pleasure working with ComSec LLC”!

    “S.S.” MD, USA
    Hired ComSec for Cyber TSCM Services in 2014
  • Five Stars

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

    “Fortune 100 Corporation”
    Hired ComSec for Cyber TSCM Services in 2014
  • Five Stars

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

    “John” U.S. Defense Contractor
    Hired ComSec for Cyber TSCM Services in 2011, 2012, 2013, 2014
  • Five Stars

    “The response and attitude of your team was outstanding. Will definitely use ComSec again”.

    “Bill”, Fortune 500 Corporation
    Hired ComSec for Cyber TSCM Services in 2013 & October 2014
  • Five Stars

    “Thank you! I appreciate how fast you were able to get here and help me!”

    “Carrie”, Small Business owner
    Hired ComSec for Cyber TSCM Services in 2014

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