MN Drug Testing Rules for Employers

Does Minnesota law restrict workplace drug testing?

Yes, comprehensively. DATWA opens with a flat prohibition: an employer may not request or require an employee or job applicant to undergo drug and alcohol testing except as authorized in the statute. Minn. Stat. § 181.951, subd. 1(a). Even where testing is authorized, it may not be done on an arbitrary or capricious basis.

Two threshold conditions sit on top of every Minnesota testing program:

1. The employer must have a written policy that meets the minimum content and notice requirements of Minn. Stat. § 181.952.
2. The employer must use either a certified or accredited laboratory under Minn. Stat. § 181.953, subd. 1, or the oral fluid testing procedures added in 2024.

A program missing either the policy or a compliant testing method is unauthorized regardless of how legitimate the business reason for the test.

What are the only situations where I can test?

DATWA recognizes five testing categories, and they are exclusive. Testing outside these categories is unauthorized.

1. Job applicant testing. After a conditional job offer, an employer may test if the same test is given to all applicants for that position. Minn. Stat. § 181.951, subd. 2.

2. Routine physical examination testing. Existing employees may be tested as part of a routine physical no more than once a year, with at least two weeks’ advance written notice. Minn. Stat. § 181.951, subd. 3.

3. Random testing. Random testing is restricted to two narrow groups: employees in safety-sensitive positions and professional athletes covered by a collective bargaining agreement permitting the testing. Minn. Stat. § 181.951, subd. 4. Most office, sales, retail, and management positions cannot be randomly tested at all.

4. Reasonable suspicion testing. An employer may test an employee where the employer reasonably suspects the employee (a) is under the influence at work, (b) has violated a written work rule prohibiting drugs or alcohol, (c) has sustained a personal injury, or (d) was involved in a work-related accident. Minn. Stat. § 181.951, subd. 5. “Reasonable suspicion” is defined by the statute as a belief based on specific facts and rational inferences drawn from those facts. Minn. Stat. § 181.950, subd. 12. Vague impressions and second-hand reports without more do not satisfy this standard.

5. Treatment program testing. Employees enrolled in a chemical dependency evaluation or treatment program, or who have completed one, may be tested without notice during evaluation and for up to two years after treatment. Minn. Stat. § 181.951, subd. 6.

The statute also includes the underappreciated rule that employers have no legal duty to test at all. Minn. Stat. § 181.951, subd. 7. Testing is voluntary on the employer side. The trade-off is that once you opt in, the rules are mandatory.

What must my written drug testing policy contain?

The statute lists six minimum elements, every one of which must appear in the document:

1. The employees or job applicants subject to testing under the policy.
2. The circumstances under which drug and alcohol and cannabis testing may be requested or required.
3. The right of an employee or job applicant to refuse to undergo testing and the consequences of refusal.
4. Any disciplinary or other adverse personnel action that may be taken based on a confirmatory test verifying a positive initial screening test.
5. The right of an employee or job applicant to explain a positive result on a confirmatory test or to request and pay for a confirmatory retest.
6. Any other appeal procedures available.

Minn. Stat. § 181.952, subd. 1. A policy missing any of the six elements is non-compliant on its face, and the employer cannot rely on it to authorize a test or a discharge. Most enforcement disputes start here: a stock policy pulled from a national HR template will often omit the explanation right, the retest right, or the appeal procedures, all of which are mandatory in Minnesota.

If you intend to enforce cannabis work rules (no use, possession, or impairment while working, on the premises, or operating company equipment), those rules must be in the same written policy and the policy must contain the six minimum elements. Minn. Stat. § 181.952, subd. 3. A cannabis prohibition that lives in a separate handbook section without the DATWA-compliant policy elements is unenforceable for testing purposes.

What notice must I give employees and applicants?

DATWA requires four overlapping notices, all in writing:

• On adoption of the policy, to all affected employees.
• On transfer to an affected position, to a previously non-affected employee.
• On hire, to a job applicant before any testing if the offer is contingent on passing a test.
• Posted notice in an appropriate and conspicuous location on the employer’s premises that the employer has adopted a testing policy and that copies are available for inspection in the personnel office or other suitable location.

Minn. Stat. § 181.952, subd. 2. The applicant notice rule deserves special attention. Conditional-offer letters that reference “drug screening” without delivering the policy itself before the test do not satisfy this requirement.

When can I randomly test employees?

In my practice, the random-testing rules generate the bulk of DATWA disputes. The statute permits random testing only for safety-sensitive positions and for professional athletes under a collective bargaining agreement. Minn. Stat. § 181.951, subd. 4. A “safety-sensitive position” is defined as one in which an impairment caused by drug, alcohol, or cannabis usage would threaten the health or safety of any person. Minn. Stat. § 181.950, subd. 13.

Two operational points trip up employers:

The selection mechanism must be truly random. Random selection requires equal probability that any employee in the pool will be selected, with no employer discretion. Minn. Stat. § 181.950, subd. 11. A supervisor “drawing a name” from a list of employees the supervisor pre-selected is not a random selection.

Designations must be defensible. A position is not safety-sensitive because the employer says so. The functions actually performed must be ones in which impairment threatens health or safety. Aggressively over-designating positions, especially office or administrative roles that occasionally drive between buildings or operate light machinery, invites a successful challenge to the entire random program.

How does cannabis change the analysis after Minnesota’s legalization?

The 2023 cannabis legalization amendments materially changed how DATWA treats marijuana, hemp products, and lower-potency hemp edibles. Three points dominate the analysis:

1. Cannabis is no longer a “drug” under DATWA. Minn. Stat. § 181.950, subd. 4 excludes marijuana, tetrahydrocannabinols, cannabis flower, cannabis products, lower-potency hemp edibles, and hemp-derived consumer products from the definition. The statute now creates a separate “cannabis testing” category. A traditional five-panel drug screen that returns positive for THC is governed by the cannabis rules, not the general drug rules.

2. Applicant cannabis testing is generally prohibited. Employers may not require an applicant to undergo cannabis testing, and may not refuse to hire based solely on a positive cannabis test, unless state or federal law requires the test or the position falls into a statutory exception. Minn. Stat. § 181.951, subds. 8 and 9. The exceptions list is narrow: safety-sensitive positions, peace officers, firefighters, positions providing care to children, vulnerable adults, or patients, commercial driver positions subject to CDL requirements, federally funded positions where federal law requires testing, and positions where state or federal law specifically requires cannabis testing.

3. Employers may still prohibit on-the-job use, possession, and impairment. Minn. Stat. § 181.952, subd. 3 permits written work rules barring cannabis use, possession, impairment, sale, or transfer while working, on the premises, or operating company equipment. The rules must live inside a DATWA-compliant written policy. Off-duty, off-premises cannabis use that does not produce on-the-job impairment is, for non-excepted positions, generally outside the employer’s reach.

The cannabis-positive employee in a non-excepted role is the hardest case under current law. A mere positive result, without a written cannabis work rule, without on-duty impairment, and without a position that falls inside the § 181.951, subd. 9 exception list, generally cannot support discipline. Minn. Stat. § 181.953, subd. 10a ties adverse cannabis-related action to one of those triggers.

What must I do after a first positive confirmatory test?

This is the rule out-of-state employers most often miss. For a first positive confirmatory test, a Minnesota employer may not discharge the employee unless the employer has first given the employee the opportunity to participate, at the employee’s own expense or pursuant to coverage under an employee benefit plan, in a drug, alcohol, or cannabis counseling or rehabilitation program. The program is one determined by the employer after consultation with a certified chemical use counselor or a physician trained in the diagnosis and treatment of substance use disorder. Minn. Stat. § 181.953, subd. 10.

While a confirmatory test is pending, the employer may temporarily suspend the employee or transfer the employee to another position at the same rate of pay where reasonably necessary to protect the health or safety of the employee, coworkers, or the public; if the confirmatory test comes back negative, the employee is entitled to back pay. Minn. Stat. § 181.953, subd. 10(c). The employer may discharge the employee for refusing to participate, for failing to complete the program, or for a second positive confirmatory test result. The first-positive rehabilitation requirement does not apply to job applicants. For applicants, an employer may not withdraw a contingent job offer based on an initial screening positive that has not been verified by a confirmatory test, but may withdraw it after a confirmatory positive. Minn. Stat. § 181.953, subd. 11. The cannabis exceptions described above modify these rules for cannabis-positive results.

A discharge after a first positive that skipped the rehabilitation step is the textbook DATWA violation. Damages, attorney fees, and reinstatement with back pay all flow from this single mistake.

What rights does an employee have during the testing process?

DATWA layers several procedural protections that a written policy must reflect:

• Right to refuse, with the consequences spelled out in the policy. § 181.952, subd. 1(3).
• Confirmatory testing. Every positive initial screen must be confirmed by a confirmatory test before any adverse action. § 181.953, subd. 3.
• Right to explain a positive confirmatory result, including listing prescription and over-the-counter medications taken. § 181.953, subd. 6.
• Right to a confirmatory retest at the employee’s expense. § 181.952, subd. 1(5).
• Privacy of results. The lab may report only presence/absence data; the result is private (private sector) or classified as private data under chapter 13 (public sector); no disclosure to other employers or third parties without written consent. § 181.954, subds. 1 and 2.
• No criminal use. Positive results may not be used as evidence in a criminal proceeding against the tested employee or applicant. § 181.954, subd. 4.
• Oral fluid testing rights. If the employer uses oral fluid testing, an employee with a positive oral fluid result has 48 hours to request laboratory confirmation at no personal cost, and DATWA’s full protections apply to that lab confirmation. § 181.953, subd. 5a.

What happens if I get this wrong?

DATWA creates a private right of action with full remedies. Minn. Stat. § 181.956. Available relief includes:

• Civil damages.
• Injunctive relief.
• Equitable relief, including reinstatement with back pay.
• Reasonable attorney fees if the court determines the employer acted knowingly or recklessly.

Retaliation is separately prohibited. An employer may not discharge, discipline, penalize, interfere with, threaten, restrain, coerce, or otherwise retaliate or discriminate against an employee for asserting rights under DATWA. § 181.956, subd. 5. Retaliation claims under this section have their own remedies independent of the underlying testing violation.

For employees covered by a collective bargaining agreement, the employee must first exhaust the grievance procedures under the contract, but may still bring a court action if the bargaining agent declines to grieve. § 181.956, subd. 1.

Are CDL drivers and other federally regulated positions covered?

Federal preemption is handled separately by Minn. Stat. § 181.957. DATWA’s protections do not apply to employees and applicants required to undergo testing by federal regulations that preempt state regulation, by federal rules necessary to operate a federally regulated facility, by federal contracts requiring testing for security, safety, or sensitive data, or by state rules adopting those federal regulations.

The most common application is U.S. DOT testing of commercial driver’s license holders under 49 C.F.R. Part 382. State DATWA protections still apply to those drivers to the extent they are not inconsistent with the federal program. § 181.957, subd. 2. In practice, most multi-employee Minnesota employers with even one CDL driver run two parallel programs: a DOT-compliant program for the regulated drivers and a DATWA-compliant program for everyone else. Mixing them is the dominant cause of compliance failure.

How does a collective bargaining agreement interact with DATWA?

A union contract may meet or exceed DATWA’s protections, but may not undercut them. Minn. Stat. § 181.955, subd. 1. Pre-existing CBA protections that exceed DATWA remain enforceable. § 181.955, subd. 2. Many Minnesota CBAs lock in tighter random-testing rules, longer cure periods, or “last chance” frameworks that go beyond DATWA’s first-positive rehabilitation rule, and those terms control over weaker employer policies.

Bottom line for Minnesota employers

DATWA is a checklist statute. The categories are narrow, the policy elements are mandatory, the lab standards are explicit, and the procedural rights after a positive result are non-negotiable. The most expensive mistakes are the most predictable ones: an out-of-state policy template missing the explanation and retest rights, a random program covering positions that are not actually safety-sensitive, a first-positive discharge without offering rehabilitation, and a cannabis discipline based on a positive test alone. Each of these creates an attorney-fee-shifting cause of action.

Drug testing is one piece of a broader employer-policy framework that intersects with at-will termination rules, final-pay obligations when a positive test leads to discharge, and the written-policy discipline that also drives non-compete alternatives and other workplace-rules enforcement. For employers building or rebuilding a testing program after Minnesota’s cannabis amendments, the safest path is a clean rewrite against the current statute rather than a patch on a pre-2023 policy.

If you’d like a second set of eyes on the specific facts of a planned termination, policy rewrite, or random-testing program, email [email protected].

For broader workplace-policy questions, see the employment law practice area overview, which connects DATWA compliance to the rest of the Minnesota employer toolkit, including the firm’s employment counseling work for closely held businesses.