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The ultra-sensitive Hound® breathalyzer measures extremely low THC levels

Why Is Low THC Measurement Important?

THC (the psychoactive ingredient in marijuana) degrades very quickly in breath to concentrations below 2 parts per trillion. Hound Labs invented new technology to create a tool with the ultra-sensitivity required for THC measurement in breath.

Ultra-Sensitivity Studied by UCSF

During clinical studies, scientists at the University of California, San Francisco (UCSF) clinical toxicology lab confirmed the sensitivity of the Hound marijuana breathalyzer. To validate the extreme sensitivity and ability of the Hound breathalyzer to measure THC, the UCSF research team developed a new protocol to study baseline THC levels with sub-picogram sensitivity. UCSF researcher Y. Ruben Luo, PhD, presented the protocol at the Mass Spectrometry: Applications to the Clinical Lab 2018 conference (MSACL 2018 US).

UCSF Trial Confirms THC in Breath During Window of Peak Impairment

The latest clinical trial results from the University of California – San Francisco (UCSF) confirm that THC is detectable in breath for up to three hours after smoking marijuana. Beyond three hours, THC levels drop to virtually undetectable levels.

 

The three-hour timeframe is significant because research has shown that this is when people are most likely to be impaired. Other marijuana tests – urine, blood, oral fluid, hair – detect previous use that is well outside the window of peak impairment. Dr. Kara Lynch, Associate Professor of Laboratory Medicine at UCSF, also showed that ultra-sensitive measurement capabilities are required to measure THC levels as low as one trillionth of a gram per liter of breath. Dr. Lynch published her findings in Clinical Chemistry.

Additional Product Validation

The Hound Labs team conducts laboratory tests, driving tests, field tests, and research with human subjects who use marijuana to confirm maximum accuracy, reliability, and usability of the Hound marijuana breathalyzer.

Clinical Trials

Clinical Trials at UCSF

Hound Labs started clinical trials in May 2017 at the University of California, San Franciso, to independently verify the efficacy of the Hound Labs technology. Initial findings confirm the ulra-sensitivity of the Hound Labs tool against highly accurate and sophisticated mass spectrometry. Hound Labs will continue to publish results from clinical trials as they become available.

Driving Tests

High-Speed Track Tests of Marijuana-Impaired Drivers

In June 2017, the company conducted the first high-speed driving tests and used the Hound® marijuana breathalyzer to collect breath samples of THC (the psychoactive ingredient in marijuana) from drivers when they were sober and after they had smoked marijuana. The Hound Labs team designed the driving course in conjunction with scientists from Triple Ring Technologies to specifically test the skills that can be frequently impaired after recent marijuana use. Participants attempted to maintain speeds up to 65 mph while driving the course.

 

Drivers navigated the course error-free while they were sober and then navigated the course again within 30 minutes of smoking marijuana. All three drivers who participated in this study made several serious errors while driving the course under the influence of marijuana. Although the research team cannot yet draw conclusions from a small sample size, a few observations will inform future research. Most notably, all drivers appeared to have diminished peripheral awareness – hitting a bicycle that was on the shoulder of the road. Two of the drivers were not even aware they caused this crash. In addition, the drivers exhibited an overall deterioration in their abilities to focus.

 

The drivers who participated in the June 2017 driving test performed similarly to the those who participated in the driving test in the spring of 2016. During the 2016 test, drivers navigated a much shorter loop on a different course at speeds up to 45 mph.

Learn More

Hound Labs high-speed track driving, June 2017
  • Media Release

    News about 2017 track tests

  • Video

    Do You Drive Better Stoned?

  • News

    Bay Area company develops breathalyzer... ~ KRON 4

  • News

    Bay Area company develops test to measure ... ~ ABC 7

Field Tests

Field Tests with Law Enforcement

Hound Labs conducted the first field tests of a marijuana breathalyzer at the roadside with law enforcement. In the summer of 2016, law enforcement personnel in California used the Hound® marijuana breathalyzer with people suspected of driving under the influence of marijuana. Those roadside tests provided valuable information on product performance and usability.

 

Hound Labs continues to partner with law enforcement agencies to constantly improve product features and functionality.

  • Media Release

    News about 2016 field tests

  • News

    State Patrol 2nd Year Testing...
    ~ ABC News

  • Contact Us

    Want to join our field tests? Fill out this form.

Clinical Trials

Clinical Trials at UCSF

Hound Labs started clinical trials in May 2017 at the University of California, San Franciso, to independently verify the efficacy of the Hound Labs technology. Initial findings confirm the ulra-sensitivity of the Hound Labs tool against highly accurate and sophisticated mass spectrometry. Hound Labs will continue to publish results from clinical trials as they become available.

Driving Tests

High-Speed Track Tests of Marijuana-Impaired Drivers

In June 2017, the company conducted the first high-speed driving tests and used the Hound® marijuana breathalyzer to collect breath samples of THC (the psychoactive ingredient in marijuana) from drivers when they were sober and after they had smoked marijuana. The Hound Labs team designed the driving course in conjunction with scientists from Triple Ring Technologies to specifically test the skills that can be frequently impaired after recent marijuana use. Participants attempted to maintain speeds up to 65 mph while driving the course.

 

Drivers navigated the course error-free while they were sober and then navigated the course again within 30 minutes of smoking marijuana. All three drivers who participated in this study made several serious errors while driving the course under the influence of marijuana. Although the research team cannot yet draw conclusions from a small sample size, a few observations will inform future research. Most notably, all drivers appeared to have diminished peripheral awareness – hitting a bicycle that was on the shoulder of the road. Two of the drivers were not even aware they caused this crash. In addition, the drivers exhibited an overall deterioration in their abilities to focus.

 

The drivers who participated in the June 2017 driving test performed similarly to the those who participated in the driving test in the spring of 2016. During the 2016 test, drivers navigated a much shorter loop on a different course at speeds up to 45 mph.

Learn More

Hound Labs high-speed track driving, June 2017
  • Media Release

    News about 2017 track tests

  • Video

    Do You Drive Better Stoned?

  • News

    Bay Area company develops breathalyzer... ~ KRON 4

  • News

    Bay Area company develops test to measure ... ~ ABC 7

Field Tests

Field Tests with Law Enforcement

Hound Labs conducted the first field tests of a marijuana breathalyzer at the roadside with law enforcement. In the summer of 2016, law enforcement personnel in California used the Hound® marijuana breathalyzer with people suspected of driving under the influence of marijuana. Those roadside tests provided valuable information on product performance and usability.

 

Hound Labs continues to partner with law enforcement agencies to constantly improve product features and functionality.

  • Media Release

    News about 2016 field tests

  • News

    State Patrol 2nd Year Testing...
    ~ ABC News

  • Contact Us

    Want to join our field tests? Fill out this form.

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