South Dakota Drug Testing Laws: What Private Employers Can and Cannot Mandate

Operating a manufacturing plant in Sioux Falls, a regional freight terminal in Rapid City, or an agricultural processing facility in Aberdeen requires balancing workplace safety against evolving state medical cannabis rules. Terminating a worker or rescinding an employment offer over a flawed drug screen can expose your company to wrongful discharge litigation, administrative unemployment appeals, or federal disability discrimination claims. Because South Dakota does not have a single overarching statute restricting private-sector workplace drug testing, employers must navigate a patchwork of common-law employment doctrines, medical marijuana statutes, and federal safety regulations.

Under South Dakota's at-will employment doctrine codified at S.D. Codified Laws § 60-4-4, private businesses generally retain broad discretion to implement pre-employment, reasonable suspicion, post-accident, and random drug and alcohol testing programs. However, that discretion is narrowed by statutory protections for registered medical cannabis patients under S.D. Codified Laws § 34-20G-22 and strict contractual obligations created by employee handbooks. Reviewing your testing protocols with an experienced South Dakota employment lawyer from our directory can help protect your business from costly compliance errors.

Legal Framework for Pre-Employment, Random, and Medical Cannabis Testing in South Dakota

Unlike neighboring Minnesota, which imposes rigid statutory limits on random testing, South Dakota law permits private employers to conduct both pre-employment and unannounced random drug tests across their workforce, provided the selection process is neutral and non-discriminatory. For job applicants, testing should occur only after extending a conditional offer of employment to avoid violating the Americans with Disabilities Act under 42 U.S.C. § 12112(d), as prescription medication disclosures during a drug screen can inadvertently reveal protected disabilities.

The most frequent compliance trap for South Dakota employers involves the state's medical cannabis program overseen by the South Dakota Department of Health, Office of Medical Cannabis, Pierre. Under S.D. Codified Laws § 34-20G-22, a registered qualifying patient holding a valid state card enjoys the same rights under state law as an individual prescribed a pharmaceutical medication, meaning an employer generally cannot refuse to hire or terminate a cardholder solely because of a positive test for non-impairing cannabis metabolites, unless failing to do so would cause the employer to lose a monetary or licensing-related benefit under federal law or regulations.

At the same time, S.D. Codified Laws § 34-20G-24 explicitly protects employers by stating that nothing in the medical cannabis chapter requires an employer to allow the ingestion of cannabis in any workplace or to allow any employee to work while under the influence of cannabis. Furthermore, S.D. Codified Laws § 34-20G-24 clarifies that a registered qualifying patient is not considered to be under the influence of cannabis solely because of the presence of metabolites or components of cannabis that appear in insufficient concentration to cause impairment.

Industry-Specific Drug Testing Rules in South Dakota

CDL Truck Drivers

Commercial motor vehicle operators in South Dakota are governed by federal Department of Transportation (DOT) and Federal Motor Carrier Safety Administration (FMCSA) regulations under 49 C.F.R. § 382.301 and 49 C.F.R. § 40.3, which South Dakota has adopted into state law pursuant to S.D. Codified Laws § 49-28A-3 and S.D. Codified Laws § 32-12A-36. Employers of CDL drivers must conduct mandatory pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up drug and alcohol testing, as well as query the FMCSA Drug and Alcohol Clearinghouse.

Because marijuana remains a Schedule I controlled substance under federal law pursuant to 21 U.S.C. § 812, a South Dakota medical cannabis card provides zero legal protection to a CDL driver. Under the federal preemption exception built into S.D. Codified Laws § 34-20G-22, trucking companies in Sioux Falls, Rapid City, and Watertown must remove any CDL driver who tests positive for THC from safety-sensitive duties immediately.

Heavy Machinery Operators

Businesses employing non-CDL heavy machinery operators-such as forklift drivers, crane operators, Black Hills surface mining crews, and agricultural plant technicians-can classify these roles as safety-sensitive in their written workplace policies. Establishing clear safety-sensitive designations allows employers to enforce strict random testing and zero-tolerance impairment rules to prevent catastrophic workplace injuries.

When a heavy machinery operator is injured on the job, drug testing plays a decisive role in workers' compensation liability. Under S.D. Codified Laws § 62-4-37, no workers' compensation benefits are payable for an injury or death caused by the employee's willful misconduct, including intoxication or the illegal use of any Schedule I or Schedule II drug. The South Dakota Supreme Court upheld this statutory bar in Goebel v. Warner Transportation, 612 N.W.2d 18 (SD Supreme Court 2000) and Therkildsen v. Fisher Beverage, 545 N.W.2d 834 (SD Supreme Court 1996), where reliable post-incident toxicology evidence proved that drug use or intoxication was a substantial factor in causing the workplace accident.

Office Staff and Administrative Personnel

For clerical, remote, and administrative office staff in low-hazard environments, employers must exercise caution when disciplining workers who hold a state medical cannabis card. If an accountant or customer service representative in Brookings or Pierre tests positive for THC during a pre-employment or random screen and presents a valid registry card issued by the South Dakota Department of Health, Office of Medical Cannabis, Pierre, firing the worker without documented evidence of on-the-job impairment can trigger a civil claim under S.D. Codified Laws § 34-20G-22.

Employers must also ensure their internal testing procedures strictly match their employee handbooks. In Butterfield v. Citibank of South Dakota, N.A., 437 N.W.2d 857 (SD Supreme Court 1989), the South Dakota Supreme Court recognized that while employment is presumptively at-will, specific disciplinary procedures promised in an employee handbook can create binding contractual obligations if the handbook lacks a conspicuous at-will disclaimer.

Healthcare Workers

Hospitals, surgical centers, and long-term care facilities in Sioux Falls, Rapid City, and Yankton operate under strict federal Medicare and Medicaid conditions of participation alongside state professional licensing boards. Registered nurses, licensed practical nurses, and physicians are subject to oversight by the South Dakota Board of Nursing, Sioux Falls and the South Dakota Board of Medical and Osteopathic Examiners, Sioux Falls.

Under S.D. Codified Laws § 36-9-49, practicing nursing while impaired by alcohol or drugs, or diverting controlled substances from clinical inventory, constitutes grounds for license revocation or mandatory referral to the South Dakota Health Professionals Assistance Program (HPAP). Healthcare employers typically mandate pre-employment 10-panel screens that include synthetic opioids, fentanyl, and benzodiazepines, alongside for-cause testing whenever medication dispensary counts show discrepancies.

Step-by-Step Process for Workplace Drug Testing in South Dakota

Step 1: Draft and Distribute a Compliant Drug-Free Workplace Policy

Before collecting a single specimen, employers should adopt a clear written policy detailing which employee classifications are subject to pre-employment, random, reasonable suspicion, and post-accident testing. The policy must explicitly preserve the at-will employment relationship under S.D. Codified Laws § 60-4-4 and define how registered medical cannabis patients must disclose cardholder status to a Medical Review Officer (MRO).

Step 2: Obtain Written Consent and Use Proper Chain-of-Custody Forms

Require every applicant or employee to sign a written consent and release form authorizing the collection facility to share verified test results with management. For federally regulated transportation employees, collectors must use Form OMB 0930-0158, FED, SAMHSA, Federal Drug Testing Custody and Control Form, while non-DOT private employers should use a standardized forensic Custody and Control Form to document specimen integrity.

Step 3: Collect Split Specimens at a Certified Laboratory

Direct the worker to an accredited collection clinic where the sample is divided into a primary specimen and a split specimen. Using laboratories certified by the Substance Abuse and Mental Health Services Administration (SAMHSA) or the College of American Pathologists ensures that the testing methodology can withstand scrutiny before the South Dakota Department of Labor and Regulation, Pierre or a state circuit court.

Step 4: Verify Non-Negative Screens Through GC/MS and an MRO

Never terminate an employee based solely on an instant point-of-collection cup test, which can produce false positives from over-the-counter medications. Any non-negative initial immunoassay screen should undergo confirmatory Gas Chromatography/Mass Spectrometry (GC/MS) testing and review by a licensed Medical Review Officer, who contacts the worker privately to verify valid prescriptions or South Dakota medical cannabis registration.

Step 5: Document Impairment and Execute Lawful Adverse Action

If the MRO verifies a positive result for an illicit substance-or if a medical cannabis cardholder exhibited contemporaneous physical impairment on the job documented by two trained supervisors-the employer may proceed with discipline or termination. When a terminated employee files for unemployment benefits with the South Dakota Department of Labor and Regulation, Unemployment Insurance Division, Aberdeen, providing the verified MRO report and signed policy acknowledgment helps establish disqualifying work-connected misconduct under S.D. Codified Laws § 61-6-14.1.

Timeline for Post-Accident Testing and Result Verification

Timing is critical when conducting post-accident drug and alcohol testing in South Dakota, both to comply with federal safety standards and to preserve an intoxication defense under S.D. Codified Laws § 62-4-37. Employers must also ensure that post-accident testing is not conducted in a retaliatory manner that discourages workers from reporting workplace injuries under federal OSHA rules at 29 C.F.R. § 1904.35(b)(1)(iv).

• Post-Accident Alcohol Testing Window: Breath or blood alcohol testing should be administered within 2 hours of the workplace accident. If testing cannot be completed within 2 hours, the employer should document the reason for the delay, and must cease attempts to administer an alcohol test after 8 hours (mirroring the federal standard in 49 C.F.R. § 382.303).
• Post-Accident Drug Testing Window: Urine or oral fluid drug specimen collection must occur as soon as medically practicable and no later than 32 hours after the workplace accident.
• Laboratory Turnaround Times: Negative initial laboratory screens are typically reported to the employer within 24 to 48 hours. Non-negative specimens requiring GC/MS confirmation and Medical Review Officer interviews generally take 3 to 5 business days.
• Split-Specimen Retest Requests: Under standard forensic protocols and DOT rules, an employee who disputes a verified positive result has 72 hours from MRO notification to request that the split specimen be tested at an independent SAMHSA-certified laboratory.

How Much Does Workplace Drug Testing Cost in South Dakota?

While South Dakota statutes do not explicitly address who pays for drug testing, industry standard and federal wage-and-hour rules require employers to cover the cost of mandatory pre-employment, random, and post-accident tests-especially if deducting the fee would reduce an employee's pay below the South Dakota statutory minimum wage under S.D. Codified Laws § 60-11-3. If an employee demands a retest of a split specimen after a confirmed positive result, the employer may require the employee to reimburse the retest cost if the second lab confirms the positive finding.

Frequently Asked Questions (FAQ)