Frequently Asked Questions

HOUND LABS BACKGROUND & DEVICE

Why did Hound Labs set out to solve the problem of determining recent marijuana use?

Dr. Mike Lynn founded Hound Labs, because he passionately believes the tragedies associated with impaired driving are preventable. As an ER physician at a trauma center and a reserve deputy sheriff, Dr. Lynn has witnessed the consequences of impaired driving too often.

How does the Hound marijuana breathalyzer work?

The Hound® marijuana breathalyzer is easy to use, like an alcohol breathalyzer. A driver or employee breathes into the mouthpiece on the breathalyzer. The disposable cartridge on the breathalyzer automatically captures two breath samples. After the breath samples have been collected, the cartridge is removed and placed in a small portable processor that then measures alcohol and THC in one of the samples. Within a few minutes, the results for both alcohol and THC are displayed. If desired, the cartridge can be saved so the second sample can be analyzed in the future.

Does your device measure THC in breath?

Yes, the Hound® breathalyzer measures THC in breath to levels as low as 1 trillionth of a gram, or 1 picogram per liter of breath (1pg/L). This is the sensitivity required to measure recent marijuana use throughout the 2-3 hour window of peak impairment identified by researchers.

Does the Hound marijuana breathalyzer detect THC in breath if someone has eaten an edible marijuana product?

Yes. Our device is able measure THC in the breath after subjects have consumed a variety of smoked, vaporized, and edible marijuana products.

IMPORTANCE OF RECENT USE

Why is breath better than blood, urine, or saliva at determining recent use?

Breath is a better indicator of impairment than blood, urine, or saliva because THC only remains in breath for a few hours before becoming virtually undetectable, whereas it can remain in other body fluids for many hours, days, or even weeks after smoking. The period of time during which THC can be measured in breath aligns with the peak impairment window (2-3 hours) identified by independent researchers [NHTSA]. This makes a marijuana breathalyzer the best objective test for determining whether a person used marijuana recently and could still be impaired, which is in what employers and law enforcement are interested.

LAWS & REGULATIONS

Are there problems with current laws regarding driving while high?

Yes. Although well-intended, some states have set blood limits for THC to indicate whether a driver is impaired and dangerous behind the wheel. Unfortunately, high levels of THC can remain detectable in blood for days or even weeks, well beyond any impairment window (2-3 hours) identified long ago by independent researchers [NHTSA]. This “positive” result means that many people who are not impaired will fail oral fluid, blood, and urine tests. Some of these are legacy laws, created at a time when use of marijuana generally was illegal and “zero tolerance” laws could be enforced regardless of whether or not the presence of THC was causing impairment behind the wheel. And all of these per se laws were established before the Hound® marijuana breathalyzer was available.

With the legalization of marijuana, legislators are beginning to realize that they need new laws to accommodate legal and responsible marijuana use while still deterring and monitoring impaired driving and working. A marijuana breathalyzer is the best way to balance safety and fairness in the era of marijuana legalization because a marijuana breathalyzer only measures THC in breath for the few hours that correlate with peak impairment – NOT the presence of THC long after impairment subsides. Understanding whether someone recently used marijuana is a key piece of data to help law enforcement and employers determine whether or not the driver or employee may be impaired.  

Do any states have a legal limit as defined by THC concentrations detected on a driver’s breath?

Until commercialization of the Hound® breathalyzer, no breath device was available, and no municipal or state governments were able to establish legal limits for THC in breath. Per se laws are typically based on blood levels, but the problem is that THC can remain in blood in high concentrations long after peak impairment subsides. This makes these laws unfair to those drivers who smoked marijuana days or weeks before driving and still have THC in their blood but are no longer impaired. The important data is whether marijuana was used recently enough to be within the window of peak impairment. The presence of THC in the breath indicates recent use because it only stays in breath 2-3 hours after smoking.

Is the Hound marijuana and alcohol breathalyzer useful even though there aren’t breath-based laws for THC in place?

Employers, law enforcement, legislators, unions, and others have communicated an immediate need for the Hound® marijuana breathalyzer to help them objectively determine recent marijuana use. The only tools available right now measure THC in blood, urine, and saliva, where it can remain long after impairment subsides. These tests were useful when marijuana use was illegal and the only data that law enforcement and employers needed was to indicate the mere presence of THC in body fluids.

The Hound marijuana breathalyzer measures THC in breath which indicates that someone has smoked marijuana in the last few hours – the same time frame as the peak window of impairment. Thus, even without laws specifically related to breath levels of THC, a measurement from the Hound device provides critical data about recent use which can help inform officers’ and employers’ decisions.

For historical context, alcohol breathalyzers were used well before per se limits were standardized. They provided useful information to law enforcement regarding recent alcohol use.

PARTNERSHIPS

Has Hound Labs received any inquiries from law enforcement or employers eager to trial its product?

We have had a great deal of interest in our device from law enforcement and employers in the U.S. and across the globe and continue to receive new inquiries regularly. We are currently finalizing charter customer agreements with law enforcement agencies and employers.

Are any police departments and employers using the Hound breathalyzer yet?

We have tested versions of the Hound® marijuana breathalyzer with law enforcement as part of the development of the device. Multiple law enforcement agencies are planning to use our device when it becomes available.

With what police departments have you worked, or are you planning on working with?

We cannot comment on our relationships with individual police departments or employers at this time.

UCSF CLINICAL TRIALS

What were the details and methods of the 2nd clinical trial conducted by Dr. Kara Lynch at the University of California, San Francisco (USCF)?

Our recent study included 20 participants (including men and women who were frequent and infrequent smokers) – a number high enough to determine significance in the study’s findings and inform future trials. Participants smoked marijuana they brought themselves, and they smoked in a room separate from where they were tested in order to avoid contamination. Timed collections of breath and blood samples were done at nine time points throughout a three-hour window after smoking. Consent was acquired from all participants.

The study was conducted using a protocol approved by an Institutional Review Board (IRB) (which protects subject rights and oversees subject welfare). The study was conducted under the surveillance of clinical and research staff.

COMPANY POLICIES

What is Hound Labs’ stance on marijuana legalization?

Hound Labs does not take a stance on marijuana legalization. We do, however, take a stance on driving or working under the influence of marijuana: Don’t do it.