The company that decided the smartest way to test for impairment was not to test for the drug at all - but for the person. Its app, DRUID, gives your brain and body a number.
Above: the DRUID wordmark. A man spent forty years asking whether the mind could be measured. Then he built the thing that answers, in about the time it takes to make coffee.
Here is a fact that sounds like a joke but is not: alcohol has a number and cannabis does not. You can blow into a tube and get a blood-alcohol reading that a court will accept. There is no equivalent for weed, or for fatigue, or for the antihistamine that made you drowsy at 2 p.m. Impairment Science looked at that gap and made an unusual bet - stop trying to detect the substance, and measure the impairment directly.
The instrument for doing this is a phone. The app is called DRUID, and the premise is that impairment - whatever caused it - leaves fingerprints in how you move and decide. Your reaction time slips. Your hand-eye coordination drifts. Decisions under a little pressure get sloppier, and your balance wobbles in ways you would not notice on your own. DRUID puts you through a short battery of tasks measuring exactly those things and returns a single score, roughly between 25 and 75, benchmarked against your own sober self.
The elegant part - and the reason regulators and safety officers take the meeting - is that DRUID does not care why you are impaired. Cannabis, alcohol, exhaustion, a new prescription, the flu: they all register in the same currency. The output is not "you smoked" or "you drank." It is "your reaction time and coordination look like someone who is not currently safe to run the forklift." That is a fundamentally different, and arguably more useful, question than the one a urine test answers.
Because here is the dirty secret of conventional drug testing, which Matt-Levine-ishly is that it measures the wrong thing with great confidence. A urine screen can flag cannabis you used two weeks ago on a Saturday, when you are stone-cold sober on a Tuesday. It is precise about the substance and silent about the impairment. DRUID inverts that: silent about the substance, precise about the impairment, in the moment it actually matters.
The company is small - around sixteen people in Cambridge, Massachusetts - and its origin is almost suspiciously wholesome. It was not spun out of a defense lab or a hedge fund's idle capital. It came from a psychology professor who spent his career studying the mind and, in 2016, decided to find out whether he could turn the measuring into an app.
A DRUID test is a small obstacle course for your nervous system. You tap moving targets, respond to prompts, hold your phone steady, and make quick either-or choices. Under the hood it is measuring reaction time, decision-making, hand-eye coordination, and balance - the same functions that a breathalyzer only infers. Choose the 1-minute Rapid test for a quick check or the 3-minute Benchmark for a fuller reading. The result is calibrated to blood-alcohol impairment standards, which gives an otherwise abstract number a familiar yardstick.
The score is relative to your own sober baseline, not a population average. That personalization is what lets a single number mean the same thing for a 25-year-old EMT and a 60-year-old crane operator. (Figure is illustrative.)
Free 14-day trial on iOS and Android. Individuals use it to understand their own impairment before driving, working, or making a call they might regret - whether the cause is a couple of drinks, a late night, or a new medication.
A cloud portal that turns individual tests into workforce data - real-time monitoring, analysis, and reporting of impairment scores. Built for fitness-for-duty programs where an impaired shift is a genuine hazard.
Hooks into existing safety and HR workflows so DRUID scoring can sit inside the tools a company already runs, rather than becoming one more thing to check.
The use cases skew toward the industries that legally and morally cannot afford a bad shift: construction, mining, and EMS, plus workplace safety and personal wellness more broadly. Wilmot Modular Structures is a named customer. And the reach keeps widening - in 2024 the Massachusetts AI & Technology Center used DRUID to assess and enhance senior adults' driving performance, a use its founder probably did not sketch out in 2016.
Plenty of apps claim to measure things. What separates Impairment Science is that it did the unglamorous validation work first. It is, by its own account and the public record, the only impairment technology with three published, peer-reviewed studies validating its accuracy - backed early by a Small Business Innovation Research grant from the National Institutes of Health.
The headline study came out of Johns Hopkins School of Medicine, where faculty including Drs. Tory Spindle and Ryan Vandrey put DRUID up against ten other impairment measures in a controlled cannabis trial. Twenty participants, THC delivered by brownie and by vapor at varying doses, six eight-hour sessions each. DRUID came out the most sensitive of the bunch - and, notably, the only measure that could distinguish a 10mg dose from a 25mg one. Separately, Massachusetts State Troopers participated in studies validating alcohol detection.
Dr. Michael Milburn, after nearly 40 years teaching psychology at UMass Boston, begins building DRUID from neuroscience research on cognitive and motor function.
DRUID ships. A Wired Magazine feature generates real buzz and 10,000+ downloads within weeks. The company incorporates.
An NIH SBIR grant funds research with Johns Hopkins and Massachusetts State Troopers, turning a promising app into a peer-reviewed instrument.
The company is renamed Impairment Science, Inc. Rob Schiller becomes CEO, refocuses on B2B, and launches DRUID Enterprise for workplace safety.
A ~$1.29M round closes in 2022; by 2024 DRUID is being applied to older-adult driving fitness through the Massachusetts AI & Technology Center.
Psychology professor at UMass Boston for nearly four decades. Conceived DRUID in 2016 and remains the scientific conscience of the company.
Became CEO in 2020 and steered the company from a viral consumer app toward an enterprise safety business.
Leads how a science-first product tells its story to safety officers and everyday users alike.
Owns the engineering behind the app and the DRUID Enterprise cloud platform.
Also on the bench: William DeJong, VP & Director of Research, keeping the validation pipeline honest.
com.owl.druid.Official channel with product demos, explainers, and DRUID walkthroughs.
See the reaction-time and balance tasks that produce your impairment score.
Founder and researchers on why measuring function beats detecting substances.