Can I Require a Drug Test?

Brittney Simpson

Aug 27

4 min read

Employee discussing a workplace drug test

Usually this question shows up for one of two reasons. Either you run a business where an impaired employee could genuinely hurt someone, or you are watching a performance slide and starting to wonder what is behind it. Both are legitimate reasons to ask, and the short answer is yes, private employers can generally require drug testing.

But if your mental model of drug testing was formed more than a few years ago, it needs an update, because marijuana legalization has quietly rewritten the rules in a large share of the country, and policies that were bulletproof in 2015 are liabilities now. Here is the current map.

The yes, sorted by type of test

Pre-employment testing remains legal in most states, typically after a conditional offer and with advance notice. Random testing is more restricted: it is broadly accepted for safety-sensitive roles, the forklift operators and drivers and machine operators of the world, but several states limit or prohibit random testing for everyone else, allowing tests only with individualized reasonable suspicion.

Post-accident testing is generally permitted under a written policy, with one modern caution: federal safety regulators have warned that automatic testing after every incident can amount to retaliation if it discourages employees from reporting injuries, so the better policy tests when substance use plausibly contributed, not reflexively when anyone files a report.

Reasonable suspicion testing, the kind triggered by what a supervisor observes, is available almost everywhere, and it is also the kind most often done badly.

HR Tip: A reasonable suspicion test is only as strong as the observation record behind it. Train supervisors on the observable signs, slurred speech, odor, unsteady movement, a marked behavior change, and require them to write down what they saw, with time and date, before the test happens, ideally confirmed by a second observer. "He seemed off" is not documentation. If the employee later challenges the test, that contemporaneous note is the whole case.

Marijuana changed the game, and your policy may not know it

Here is the part founders most need to hear plainly: you can no longer assume you may test for marijuana, or act on a positive result, just because you always have. Recreational or medical marijuana is now legal in most states, and a growing number have gone further and protect employees' off-duty use.

California, Washington, New York, New Jersey, and Nevada, among others, now restrict refusing to hire or disciplining workers over cannabis test results in most jobs, and many medical marijuana states prohibit discriminating against registered patients.

The logic behind those laws exposes the underlying problem: standard urine tests detect THC metabolites, which can linger for weeks after use. A positive result tells you the person used marijuana at some point recently, possibly on a Saturday three weeks ago. It does not tell you they were impaired at work, which is the thing you actually care about.

That gap between presence and impairment is why the law is moving toward impairment-based standards, and why your policy should focus on being fit for duty at work rather than on what shows up in a metabolite screen. To be clear, no state requires you to tolerate anyone being impaired on the job. Marijuana at work remains fully actionable everywhere. It is off-duty use that many states have taken off the table.

Two federal overrides that cut opposite directions

If you employ commercially licensed drivers or other workers covered by Department of Transportation rules, federal law overrides all of it. DOT-regulated employees must be tested on the federal schedule, marijuana remains prohibited for them regardless of state legalization, and a medical card is no defense. If part of your workforce is DOT-covered and part is not, you effectively need two policies, and blending them is a common and costly mistake.

The other override runs in the employee's favor. Under the ADA, workers cannot be penalized for lawful prescription medication, and a history of addiction, or current treatment for it, carries protections of its own.

This is why positive results should go through a medical review process, where a physician confirms whether a legitimate prescription explains the result, before any manager sees or acts on it. The founder who fires someone over a positive that turns out to be prescribed ADHD medication has created a disability discrimination claim out of thin air.

The policy is the whole ballgame

Every type of testing described above shares one requirement: a written policy that exists before the test, says who gets tested, when, for what substances, by what method, and with what consequences, and is applied to everyone consistently.

Testing the warehouse but never the office, or testing the employee you are frustrated with while waving through the one you like, converts a safety program into an exhibit. And given how fast state cannabis law is moving, a policy is not a document you write once. It needs a review whenever your state's law changes or you hire in a new one.

HR Tip: Check whether your state runs a certified drug-free workplace program, because many do, and they often come with a discount on workers compensation premiums, sometimes around five percent, in exchange for adopting a compliant written policy, employee education, and defined procedures. It is one of the rare corners of HR compliance that literally pays you back.

If your drug and alcohol policy predates legalization in your state, or you are not sure it would survive contact with your newest hire's state of residence, this is a genuinely good moment for a review.

Savvy HR can audit your testing policy against current law where your people actually work, flag the marijuana provisions that no longer hold, and rebuild it around fitness for duty. Safety and compliance are not in tension here, but only if the policy is current.

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