Maine's Substance Use Testing Law was substantially revised effective July 29, 2026. Employers can still drug test, including pre-employment testing, but the rules changed in ways that make most existing policies non-compliant. Medical cannabis now counts as a legitimate medical explanation for a positive marijuana result, all confirmed positives must be reviewed by a medical review officer, and testing not tied to a real reason is prohibited.
Current as of October 2026.
What Happened
Governor Mills signed LD 2110 on April 13, 2026, amending Maine's Substance Use Testing Law at 26 M.R.S. § 681 and following. Most provisions took effect July 29, 2026.
The practical effect for a Maine employer: if your written testing policy was approved before this year and you haven't revisited it, it is probably out of compliance now. Maine requires that policy to be approved by the Department of Labor, and changes to an approved policy also require Department approval.
Can You Still Drug Test in Maine?
Yes. The law did not eliminate workplace testing. It restructured when and how.
Pre-employment testing remains permitted when conducted under a compliant written policy.
Reasonable suspicion testing is permitted, but the standard is tighter. It must rest on observable behavior at work. Information suggesting an employee may have possessed or used a substance off duty does not qualify, unless the employee was observed possessing or ingesting it on or near the employer's premises during or immediately before working hours.
Random testing is permitted in defined circumstances — safety-sensitive positions, collectively bargained workplaces, and employers meeting the requirements Maine law establishes.
Criteria-based testing is a new category introduced by the revision, alongside options including customer-required pre-access testing and annual testing.
Arbitrary testing is prohibited. The law now defines this — testing tied to an event with no connection to substance use. If your policy tests people because of something unrelated to impairment or safety, that provision no longer works.
The Marijuana Question
This is what most Maine employers are actually asking, and the answer has two parts.
Off-duty marijuana use is protected in Maine. That was already the case before this revision and remains so.
Medical cannabis is now a legitimate medical explanation. Under LD 2110, an employee enrolled in Maine's medical cannabis program who tests positive for marijuana has a legitimate medical explanation for that result. Authorized medical cannabis use is treated the way authorized use of a prescription medication is treated. Such an employee is not subject to workplace sanctions solely on the basis of that positive test.
This matters more than it first appears because of how the tests work. Standard employment drug testing relies on urinalysis, which detects an inactive THC metabolite that can remain present long after any impairment has passed. A positive marijuana result is not evidence that someone is impaired at work.
For employers, the practical consequence is that a positive marijuana screen is now the beginning of a process rather than the end of one.
The Medical Review Officer Requirement
This is the structural change most employers will notice first.
Confirmed results must now be reviewed and reported by a medical review officer — a licensed physician responsible for receiving laboratory results from an employer's testing program and evaluating medical explanations for certain results. Results no longer go straight from the laboratory to the employer.
The law also changes the terminology. An initial screen that is not clean is now "non-negative" rather than "positive," with confirmation testing following. The distinction is meaningful: a non-negative screen is not a finding of anything until it has been confirmed and reviewed.
If you run a testing program, you need an MRO arrangement in place. This is the single most common gap in policies written under the old rules.
Other Changes Worth Knowing
Blood testing. An employee may request that a blood sample be taken for testing. The employer must ensure the testing facility and the confirmation laboratory accept blood samples and are able to test them.
Union policies. The prior exemption allowing unions to withhold testing policies from the Department has been removed.
Federal standards. Employers subject to federal drug testing requirements must apply those same standards to employees who are not federally mandated to be tested, creating consistency within a single workplace.
CDL and DOT. Federal Department of Transportation rules continue to control CDL-related testing. If you run commercial drivers, that framework is unchanged by Maine's revision.
Sample collection. An employer meeting the requirements governing test facilities may be considered a qualified testing laboratory for collecting samples from employees.
What Maine Employers Should Do
Pull your written policy and read it. If it was drafted before 2026, assume it needs work. The MRO requirement alone is likely missing.
Check your reasonable suspicion language. If it permits testing based on reports of off-duty conduct, that no longer holds.
Arrange an MRO. Most third-party testing providers can supply one, but you need it specified.
Decide what marijuana testing is actually for. Given that off-duty use is protected and medical cannabis is a legitimate explanation, employers outside safety-sensitive and federally regulated roles should think about what a marijuana screen is accomplishing. Some Maine employers have narrowed testing to safety-sensitive positions for this reason. Others in construction, trucking and manufacturing have kept broader programs because of insurance requirements or customer contracts. Both are defensible; the question is whether yours is deliberate.
Resubmit for Department approval. Policy changes require Maine Department of Labor approval, so build that into your timeline rather than discovering it afterwards.
Frequently Asked Questions
Can Maine employers drug test for marijuana?
Employers can test, but off-duty marijuana use is protected in Maine, and as of July 29, 2026, enrollment in Maine's medical cannabis program constitutes a legitimate medical explanation for a positive marijuana result. An employee in that program cannot be sanctioned solely because of a positive test.
Is pre-employment drug testing legal in Maine?
Yes, when conducted under a written policy approved by the Maine Department of Labor and in accordance with applicable requirements.
What is arbitrary drug testing under Maine law?
Testing tied to an event that has no connection to substance use. The revised law defines and prohibits it. Testing must have a legitimate basis — reasonable suspicion from observable workplace behavior, a compliant random program, criteria-based testing, or another permitted category.
Does Maine require a medical review officer?
Yes, as of July 29, 2026. Confirmed results must be reviewed and reported by a medical review officer, who must be a licensed physician, rather than going directly from laboratory to employer.
Can I fire someone for a positive drug test in Maine?
It depends on the substance, the role and the circumstances. A positive marijuana result from someone enrolled in Maine's medical cannabis program carries a legitimate medical explanation and cannot by itself support a sanction. Other situations vary. This is a question for an employment attorney rather than a web page.
Do Maine's new drug testing rules apply to CDL drivers?
Federal Department of Transportation rules continue to govern CDL-related testing. Maine's revision does not displace that framework.
Does my drug testing policy need state approval in Maine?
Yes. Maine requires employer substance use testing policies to be approved by the Department of Labor, and changes to an approved policy also require approval.
Where to Get the Details
The full text of LD 2110 is available through the Maine Legislature. The Maine Department of Labor's Bureau of Labor Standards administers the Substance Use Testing Law and can be reached at 207-623-7900. The Bureau offers free compliance classes for employers.
This page summarizes publicly available information about Maine law for general purposes and is not legal advice. Substance testing carries real liability, and employers should have their policy reviewed by a Maine employment attorney before relying on it.
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