Insight

Missouri Employers Beware: Employment Protections Under Constitutional Amendment 3

Karen E. Milner

Written by Karen E. Milner

Published: December 22, 2022

Missouri Employers Beware: Employment Protections Under Constitutional Amendment 3

On November 8, 2022, Missouri voters passed Constitutional Amendment 3 (the “Amendment”), which made limited marijuana use lawful in the State of Missouri for persons over the age of 21. The Amendment took effect December 8, and as a result, persons over the age of 21 may purchase and possess up to three (3) ounces of marijuana, and may grow a limited number of plants if registered with the Missouri Department of Health and Senior Services for cultivation of marijuana plants. In addition, the Amendment provides for expungement of certain marijuana-related offenses and provides a mechanism for persons incarcerated to petition the sentencing court to vacate the conviction.

For Missouri employers, the most critical provision is the prohibition on discrimination against persons who are medical marijuana qualifying patients. Unless an employer would lose monetary benefits or a licensing-related benefit under federal law, an employer cannot discriminate in hiring or any aspect of employment or otherwise penalize a person based on their status as a qualifying patient or primary caregiver with a valid identification card. This prohibition includes a bar to discrimination based on the person’s legal use of a lawful medical marijuana product off the employer’s premises during non-working hours, unless the person is “under the influence” of medical marijuana on the employer’s premises or during the hours of employment. An employer cannot discriminate against a cardholder based on a positive marijuana drug screen, unless the person used, possessed marijuana, or was “under the influence” at the place of employment, or during the person’s working hours.

However, the restrictions above do not apply to an employee in a position in which legal use of lawful medical marijuana affects a person’s ability to perform job-related employment responsibilities, the safety of others, or conflicts with a bona fide occupational qualification reasonably related to the person’s employment.

Key Takeaways:

  • The Amendment does not affect an employer’s ability to test for drugs (to include marijuana) so long as the testing program is not administered in such a way as to discriminate against medical marijuana cardholders.
  • The Amendment does limit an employer’s right to discharge an employee based on a positive marijuana drug screen, but only if the employee is a Medical Marijuana Qualifying Patient; thus, recreational users have no statutory protection.
  • Changes are likely needed to current drug testing policies as “illegal drugs” no longer covers marijuana as it is “legal” in Missouri; policies should be amended to specifically mention marijuana for employers who want to continue testing for THC.
  • “Under the influence of marijuana” has no legal definition and there is no definitive test that will indicate whether a person is “under the influence.” Until further guidance is possible from case law or otherwise, employers should use caution before carrying out disciplinary action against a qualifying patient based on a positive test for the presence of marijuana.

If you have any questions regarding this Alert, or other issues regarding Amendment 3 or marijuana use in Missouri, please contact the authors, Karen Milner, partner in our St. Louis office at kmilner@fordharrison.com, or Daniel Cardno, Associate in our St. Louis office, at dcardno@fordharrison.com. Of course, you can also contact the FordHarrison attorney with whom you usually work.

Learn More About:

Constitutional Law

Labor & Employment Law

Marijuana

Related Articles

Employers Are Budding Heads on Marijuana in the Workplace


by M. Tae Phillips and Melanie C. Cormier

As employment lawyers, we receive many questions from employers navigating marijuana legalization. Below, we answer the top three most asked questions.

Statue of Liberty holding a marijuana joint

Evolving Marijuana Laws and the Workplace


by Tess P. Anglin

How can employers enforce statutes that differ from state to state?

Red image of marijuana leaf

Legal Highlights from Georgia: Noteworthy 2018 Recognitions


by Nicole Ortiz

A summary of newsworthy content from Georgia lawyers and law firms.

A cartoon version of the city of Atlanta, Georgia

What Is a Hostile Work Environment?


by Bryan Driscoll

Not every difficult job is a hostile work environment in the eyes of the law. Here's how to tell the difference and what to do next.

Blurred image of a distressed employee in an office, surrounded by motion-blurred coworkers, conveyi

Holiday Pay Explained: Federal Rules and Employer Policies


by Bryan Driscoll

Understand how paid holidays work, when employers must follow their policies and when legal guidance may be necessary.

Stack of money wrapped in a festive bow, symbolizing holiday pay

What Is Wrongful Termination? Understanding When a Firing Becomes Illegal


by Bryan Driscoll

Losing your job can be devastating. Here’s how to tell if your termination crossed the line and what to do next.

Close-up of person's hands holding a cardboard box filled with belongings after being terminated

Supreme Court Opens New Door for Personal Injury Claims Under RICO


by Bryan Driscoll

The litigation landscape is rapidly shifting

Personal injury RICO claims marijuana hed

Changes in Employment Arbitration for 2025


by Debra Ellwood Meppen, Brandon D. Saxon and Laurie Villanueva

What businesses need to know to stay ahead of the curve.

Suited man holding up falling walls with gray and yellow backdrop

The Struggle Is Real


by Justin Smulison

Businesses are overlooking state and federal laws when downsizing or closing operations, driving a tidal wave of class action lawsuits from former employees.

Silhouetted figure has a tug of war with shadow

ERISA Reaches Its Turning Point


by Bryan Driscoll

ERISA litigation and the laws surrounding are rapidly changing, with companies fundamentally rewriting their business practices.

Beach chair and hat in front of large magnify glass

An Employer’s Guidebook to Responding to Online Harassment


by Brent Siler and Belle Harris

Navigating online defamation against your business requires strategic responses. Two employment lawyers guide how to leverage contracts, understand social media limitations and the risks of legal action.

Image of person pushing giant phone with mouth and words coming out

Attacked From All Sides: What Is Happening in the World of Restrictive Covenants?


by Christine Bestor Townsend

One employment lawyer explains how companies can navigate challenges of federal and state governmental scrutiny on restrictive covenant agreements.

Illustration of two men pulling on string with blue door between them

IN PARTNERSHIP

The Wagner Law Group: ERISA and Employment Law


by The Wagner Law Group

For more than 25 years, The Wagner Law Group has combined the personalized attention and reasonable rates of small law firms with the specialization and sophistication of large firms to tackle all of their clients' ERISA and Employment Law needs.

ERISA and employee benefits law attorney representing a client in court

IN PARTNERSHIP

Bentley & More LLP: Beacon of Hope


by Bentley & More

With a unique blend of expertise in trial advocacy and workers’ compensation, Bentley & More LLP has established itself as a beacon of hope for injured workers.

Award-Winning Trial Lawyers | Bentley & More LLP

IN PARTNERSHIP

Businesses Must Prepare for the New Department of Labor Independent Contractor Rule


by Kirby Black and Steven T. Clark

Two employment law lawyers explain how a new DOL rule making it more likely workers will be classified as employees, rather than independent contractors, has caused legal challenges and prompted businesses to reassess worker status and policies.

Block with outline of person slightly out of place from other blocks

IN PARTNERSHIP

Gust Rosenfeld P.L.C. on Protecting Arizona Employers


by Justin Smulison

Gust Rosenfeld attorney Robert D. Haws discusses emerging trends in employment litigation and how the firm’s Employment and Education Law practice groups have protected clients in and out of Arizona’s courtrooms.

Robert Haws, Chair of Gust Rosenfeld's Employment and Education Law Practice Groups,

Trending Articles

Recognizing Legal Leaders: The 2027 Best Lawyers Awards in Australia, Japan and Singapore


by Jamilla Tabbara

Market drivers, diversity trends and the elite practitioners shaping the legal landscape.

Illustrated maps of Australia, Japan and Singapore displayed with their national flags, representing

How Far Back Can the IRS Audit You?


by Bryan Driscoll

Clear answers on IRS statutes of limitations, recordkeeping and what to do if you are under review.

Gloved hand holding a spread of one-hundred-dollar bills near an IRS tax document

Musk v. Altman: The Lawyers Behind the Case


by Jamilla Tabbara

Meet the Trial Lawyers Shaping One of AI's Biggest Legal Disputes.

Portrait photos of Elon Musk and Sam Altman positioned in front of the OpenAI logo.

The Best Lawyers in France 2027: Peer-Reviewed Excellence


by Jamilla Tabbara

Seventeen editions of peer trust, a growing profession and a dynamic legal market.

3D Map of France with National Flag Graphic

Announcing the 2027 Best Lawyers Awards: Austria, Germany and Switzerland


by Jamilla Tabbara

Celebrating the legal professionals throughout Central Europe.

Graphic displaying three-dimensional map cutouts of Austria, Germany and Switzerland.

The Legal Teams Behind the Blake Lively–Justin Baldoni Settlement


by Grace Greer

A closer look at the legal teams and attorneys involved in the Blake Lively–Justin Baldoni litigation and its resolution.

Split-screen image of Blake Lively and Justin Baldoni

How AI Is Changing the Way Clients Find Lawyers


by Jamilla Tabbara

Best Lawyers CEO Phil Greer explains how AI-driven search tools are reshaping legal marketing and why credibility markers matter.

AI chat bubble icon with stars representing artificial intelligence transforming client-lawyer conne

Colorado’s 2026 Water Rights Battles


by Bryan Driscoll

A new era of conflict begins.

Colorado Water Rights 2026: A New Era of Conflict headline

When Is It Too Late to Stop Foreclosure?


by Bryan Driscoll

Understanding the foreclosure timeline, critical deadlines and the legal options that may still protect your home.

Miniature house model on orange background surrounded by thumbtacks representing foreclosure

Can You Go to Jail at an Arraignment?


by Bryan Driscoll

Understanding What Happens at Your First Court Appearance.

A heavy chain lying on the ground in the foreground with a blurred figure standing in the background

What’s the Difference Between DUI and DWI?


by Bryan Driscoll

Understanding the terminology and consequences of impaired driving charges.

Driver during nighttime police traffic stop with officer's flashlight shining through car window

How to Choose a Personal Injury Lawyer


by Bryan Driscoll

Finding the right legal representation after an injury is a critical decision that requires careful evaluation. 

3D scene representing the deliberative process of choosing a personal injury attorney

What Happens if You Don't File Taxes


by Bryan Driscoll

The penalties are real, but so are your options. Here's what the IRS can do and what you can do about it.

A torn dollar bill revealing a watchful eye, surrounded by flying documents

When to Get a Lawyer for Work Injury


by Bryan Driscoll

Understanding your rights and navigating the complexity of workers’ compensation claims.

Injured worker receiving medical attention at workplace

What Disqualifies You From Filing Bankruptcies


by Bryan Driscoll

A guide to navigating eligibility, the means test and the legal hurdles of declaring bankruptcy.

A silhouette of a large hand pushing over a row of falling dominos toward a small figure standing be

Legal Separation vs. Divorce


by Bryan Driscoll

A clear guide to understanding the legal, financial and emotional differences between separating and ending a marriage.

Miniature figures of two people standing apart with a child figure between them on a cracked surface