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Missouri State Drug Testing Laws

Workplace Drug Testing Issues – Missouri State Laws

These categories do not affect DOT-regulated drug testing. Government employers should always call for potential additional restrictions on employee drug testing.

Workplace Drug Testing Laws in Missouri

Drug Testing IssueStatusComments
Instant or POCT TestingRestrictedUse lab testing for post-accident to use the intoxication defense. Confirm all non-negative results at the lab.
Drug PanelsNo restrictions 
LaboratoryNo restrictionsSAMHSA certified highly recommended to avoid liability exposure.
Medical Review OfficerNot requiredIt is highly recommended to use an MRO for all workplace drug tests.
Random TestingNo restrictions 
Post-AccidentNo restrictionsDrug testing policies should limit post-incident testing to situations in which employee drug use cannot be ruled out as potentially contributing to the incident.
Reasonable SuspicionNo restrictions 
Oral FluidsNo restrictions 
Hair TestingNo restrictions 
Unemployment DenialYes 
Workers Comp DiscountNo 
Intoxication DefenseYesThe law provides for a rebuttable presumption of intoxication and that that intoxication proximately caused the injury if certain conditions are met.
Medical MarijuanaYesNovember 6, 2018 – With approximately 61% of voters supporting Amendment 2, Missourians with one of 9 qualifying conditions (those without a qualifying condition can gain approval from a doctor for a medical marijuana card) will have access to purchase and grow medical marijuana. Employers are likely to retain the majority of their rights around marijuana about drug testing and disciplinary action, and Amendment 2 included language that protects employers from adverse action by medical marijuana-using employees.
Recreational MarijuanaNo 
Report Driver DOT PositivesNo 
General Statute While Missouri does not have a drug testing statute, employers must meet specific testing requirements to challenge workers’ and unemployment comp claims.

Employers should maintain comprehensive drug-free workplace programs and policies to take advantage of Unemployment Compensation Denial and Workers’ Compensation Reduction & Denial.

Intoxication Defense – Denial of Workers Compensation Claim – The Company may raise a defense to any workers’ compensation claim filed where there is positive alcohol or controlled substance test result. This could result in a 50% reduction of benefits otherwise payable or complete forfeiture of those benefits.

This chart is intended for informational purposes only and should not be relied upon for legal guidance. State and local law vary greatly; therefore, you are advised to consult experienced legal counsel during the design of your actual substance abuse testing program and with any questions that follow.

View Individual State Law Summaries

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