Last verified: May 2026
Wisconsin’s At-Will Employment Doctrine
Wisconsin is an at-will employment state. The doctrine permits an employer to terminate an employee at any time, for any reason or no reason, with very narrow statutory exceptions:
- Title VII protected classifications — race, color, religion, sex, national origin (federal).
- Age discrimination — ADEA for 40+ (federal).
- Disability discrimination — ADA (federal). Cannabis users are NOT protected even with documented Lydia’s Law CBD certification; cannabis use is not a disability under ADA.
- FMLA leave — for serious health condition treatment (federal).
No Lydia’s Law Employer Carveout
Lydia’s Law (Wis. Stat. § 961.32(2m)(b)) provides an affirmative defense for CBD-oil possession but does not create employment protections. Employers can fire registered Lydia’s Law cardholders for positive THC tests — even if the THC originates from the certificated CBD product.
The Hemp-Derived Delta-9 Trap
The interaction with hemp-derived Delta-9 products produces a particular employment trap: a Wisconsin worker who legally consumes hemp-derived Delta-9 in a Saturday beverage can fail a Monday drug screen with no statutory recourse. The OWI per se zero-tolerance principle (any detectable THC) extends conceptually to employment drug-testing — positive THC test = positive THC test, regardless of source.
Drug-Testing Modalities Permitted
- Pre-employment testing. Standard for federal contractors, federal employees, manufacturing employers, healthcare employers, and many service-sector employers.
- Random testing. Standard for federal-employee positions, federally-regulated transportation positions (DOT, FAA, FMCSA), and many manufacturing-safety positions.
- Post-accident testing. Mandatory for OSHA-regulated workplaces after injuries.
- Reasonable-suspicion testing. Permitted when an employer has reasonable basis to believe an employee is impaired.
Workers’ Comp Implications
Wisconsin workers’ comp law follows the standard pattern: positive post-accident drug test creates a rebuttable presumption that impairment caused the injury. Burden shifts to the employee to disprove. For chronic legal-hemp consumers, the persistent THC metabolite presence creates ongoing workers’-comp exposure even for accidents unrelated to cannabis use.
The Federal Layer
Federal positions have stricter cannabis-testing requirements:
- Federal employees — Executive Order 12564 (Reagan, 1986) requires drug-free federal workplace.
- Federal contractors — FAR 52.223-6 imposes drug-free-workplace requirements.
- DOT-regulated commercial drivers — 49 CFR Part 382 categorically prohibits cannabis use.
- FAA-regulated aviation positions — 14 CFR Part 67 categorically prohibits cannabis use.
- Federal cleared positions — SF-86 / Continuous Vetting issues.
Federal positions face the same prohibition framework regardless of state-law authorization. The April 28, 2026 federal Schedule III rescheduling does not directly modify federal-employee or federal-contractor drug-testing requirements as of May 2026.
Practical Notes
- Lydia’s Law does not protect employment.
- Hemp-derived Delta-9 producing positive THC tests is treated identically to illegal cannabis.
- WI cross-border travel + return + drug test: positive THC tests Monday after Saturday consumption.
- Federal-employer + federal-contractor positions have no carve-outs.
For in-depth cannabis education, dosing guides, safety information, and research summaries, visit our partner site TryCannabis.org
Related on this site: WI Federal Installations & Major..., Send a Message, Contact CannabisWisconsin.org.