SC Workplace Cannabis — At-Will Employment, No Protections

Last verified: May 2026

At-Will Employment: The Default Rule

South Carolina, like most U.S. states, follows the at-will employment doctrine: in the absence of a written contract or a statutory exception, an employer may terminate an employee for any reason or no reason, as long as the reason is not specifically prohibited by federal or state anti-discrimination law (race, sex, religion, national origin, age 40+, disability, pregnancy, etc.). Recreational or medical cannabis use — whether off-duty or on-duty — is not a protected category under SC law.

Several other states with comprehensive medical-cannabis programs have enacted statutory protection for off-duty cannabis use by registered patients (e.g., New York, Connecticut, New Jersey). South Carolina has no such statute and, given that the Compassionate Care Act has not been enacted, no statutory occasion to enact one. Even if S.53 became law, the most recent draft does not include a categorical employment-protection provision; it categorically excludes patients in certain occupations (public safety, commercial transportation, heavy machinery operation) and is silent on workplace cannabis testing for non-excluded patients.

S.C. Code Chapter 14, Title 8 — State Employees

State employees are subject to S.C. Code Chapter 14 of Title 8, which establishes the framework for state-employee drug testing. State agencies may conduct pre-employment, random, post-accident, and reasonable-suspicion testing under written agency policies. A confirmed positive cannabis test typically results in disciplinary action up to and including termination. There is no medical-cannabis exception for state employees because there is no SC medical-cannabis program.

S.C. Code § 38-73-500 — The "Drug-Free Workplace" Discount

Under S.C. Code § 38-73-500, private employers may opt into a voluntary "drug-free workplace" certification program. Certified employers receive a 5% workers’ compensation premium discount. The certification requires:

• A written drug-and-alcohol policy distributed to employees at least 30 days before testing begins
• Pre-employment testing of new hires
• For-cause / reasonable-suspicion testing
• Post-accident testing
• Employee education on substance abuse
• An employee assistance program (EAP) referral pathway

The 5% workers-comp discount is meaningful for large industrial employers; the discount alone has driven widespread adoption of drug-testing regimes among SC manufacturing, construction, and healthcare employers.

Common SC Employer Drug-Testing Practices

• Pre-employment screening. Standard practice in manufacturing, healthcare, transportation, government, federal contracting, and many service-sector roles.
• Random testing. DOT-regulated occupations (commercial driving, maritime, aviation, pipeline) require federally mandated random testing under 49 CFR Part 40 and Part 382. Many private employers also conduct random testing under SC’s drug-free workplace certification.
• Post-accident testing. Standard for any workplace accident; required for DOT-regulated incidents.
• Reasonable-suspicion testing. When supervisors observe behaviors consistent with impairment.
• Return-to-duty testing. After a positive test, employees who are eligible for reinstatement undergo testing as part of return-to-duty protocols.

Hair-Follicle and Urine Testing

Two principal testing modalities are used in SC:

• Urine testing — The most common modality. Detection windows for cannabis metabolites range from a few days (occasional use) to ~30 days (heavy use). The federal HHS-certified panel includes THC-COOH (the inactive metabolite), with confirmatory GC/MS testing on positive screens.
• Hair-follicle testing — Used by some employers for pre-employment and longer-window detection. BMW Manufacturing (Spartanburg) is a notable hair-follicle-testing employer in SC. Detection windows are ~90 days. See BMW / Boeing / Michelin page.
• Saliva / oral-fluid testing — Less common; shorter detection windows (~24 hours).
• Blood testing — Rare in employment context; more common in DUI / post-accident investigation.

SC Supreme Court — Lab Duty of Care

The South Carolina Supreme Court has held that independent labs conducting drug tests for employers owe a duty of care to tested employees. The case arose in the BMW Manufacturing context: an employee whose drug test was processed by an outside lab argued that the lab’s negligent handling caused a false-positive result that led to wrongful termination. The court held that the lab had a duty to the employee independent of its contractual relationship with BMW. This produces an indirect form of employee protection: the lab is liable for negligent testing, even though the employer is generally not liable for an at-will termination based on a confirmed positive.

Federal Preemption: DOT, Federal Contractors, Military

For occupations subject to federal drug-testing law, SC state law is irrelevant; federal law controls regardless of any state cannabis-policy posture. Federal-preemption categories prevalent in SC:

• DOT-regulated occupations. Commercial driving, maritime, aviation, pipeline. 49 CFR Part 40 and Part 382. Cannabis is a federal Schedule III substance after April 28, 2026 (down from Schedule I) but DOT testing requirements remain.
• Federal contractors. The Drug-Free Workplace Act of 1988 (41 USC § 8101) and Executive Order 12564 require drug-testing programs for federal contractors. SC has substantial federal-contractor employment via Boeing 787, Joint Base Charleston contractors, Fort Jackson contractors, etc. See federal installations page.
• Military. Active-duty, reserve, and DoD civilian employment subject to UCMJ Article 112a and DoD regulations. Total SC DoD employment exceeds 60,000.
• Healthcare and pharmaceutical. Some categories of federally regulated healthcare employment (e.g., DEA-licensed practitioners) face federal drug-policy constraints independent of state law.

Workers’ Compensation Implications

Under SC workers’ compensation law, an employee who tests positive for cannabis after a workplace injury may face:

• Reduced or denied benefits if the positive test creates a presumption of intoxication contributing to the injury.
• Rebuttable presumption. The employee may attempt to rebut the presumption with evidence that the positive test does not reflect impairment at the time of injury (cannabis metabolites linger long after acute impairment ends), but the burden of rebuttal falls on the employee.
• Employer’s 5% premium discount. Employers with drug-free workplace certification receive the discount and the presumption.

Out-of-State Medical Cards Are Not a Defense

An SC resident or visitor who holds a valid medical-cannabis card from another state has no employment-protection benefit in SC. The card does not insulate the employee from positive-test consequences. Even if the Compassionate Care Act becomes law, out-of-state cards would not be honored by SC employers because the SC program would issue its own state cards.

What the Federal Schedule III Rescheduling May Change

The April 28, 2026 DOJ Schedule III rescheduling order does not by itself change SC workplace drug-testing requirements. DOT-regulated occupations remain subject to cannabis-testing prohibitions. Federal-contractor employers remain subject to the Drug-Free Workplace Act. Private employers under SC's voluntary § 38-73-500 framework retain testing latitude. The rescheduling may, over time, alter federal HHS / SAMHSA testing-panel requirements for federal employees, but SC employer practice is not affected in the short term. See federal rescheduling mirror page.

Practical Guidance

SC residents and visitors should assume that:

• Off-duty cannabis use, even legal in another state, is legally indistinguishable from on-duty use for SC employment purposes.
• A positive pre-employment screen is grounds for offer rescission.
• A positive random test in a DOT-regulated occupation is termination plus federal-database reporting.
• Hair-follicle testing has a ~90-day detection window; abstinence schedules of 30-60 days for occasional use and 90+ days for heavy use are commonly recommended.
• Workers’ compensation benefits may be reduced or denied if a positive test creates a presumption of intoxication.