National Testing Services Contact

Drug testing in Missouri

State laws, marijuana laws, and employer compliance

Recreational marijuana: LegalMedical marijuana: LegalDOT rules apply nationwide
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For employers

Missouri drug testing laws

Governing law

Missouri Department of Labor and Industrial Relations guidance and federal DOT drug testing regulations

What you can do

Employer rights

  • Pre-employment testing allowed
  • Reasonable suspicion testing lawful
  • Post-accident testing allowed
  • Random testing allowed under employer policy
  • Return-to-duty and follow-up testing allowed
  • Employers may ban workplace drug use and impairment
  • Employers may discipline policy violators
What you must do

Compliance requirements

  • Maintain written testing policies
  • Apply procedures consistently and fairly
  • Use certified laboratories
  • Define impairment standards clearly
  • Train supervisors to spot impairment
  • Follow federal DOT rules when required

Cannabis

Missouri marijuana laws

Recreational · Legal

Recreational use

  • Legal for adults 21+
  • Personal possession permitted under state law
  • Public consumption restrictions still apply
Medical · Legal

Medical use

  • Legal for qualified patients under Missouri's medical marijuana program
At work

Workplace impact

  • Employers may still prohibit impairment
  • Drug-free workplace policies may be enforced
  • Employees impaired during work hours may be disciplined
  • Safety-sensitive and federally regulated positions remain subject to federal requirements
  • DOT-regulated employers must follow federal drug testing law
  • Because marijuana remains federally illegal, federally regulated employers must follow federal drug-free standards

Best practices

Staying compliant in Missouri

Develop detailed written drug-free workplace policies
Define impairment standards
Train supervisors to recognize impairment indicators
Stay updated on Missouri marijuana law changes
Use certified providers
Apply testing procedures consistently and fairly

Our services

Testing services in Missouri

NTS provides accurate, confidential, and legally defensible testing through our nationwide collection network.

Urine drug testingHair follicle testingOral fluid (saliva) testingNail drug testingDOT drug and alcohol testingCourt-ordered testingRandom and pre-employment screening

Sources & legal references

  1. Missouri Department of Labor & Industrial Relations
  2. Missouri Department of Health & Senior Services
  3. Missouri General Assembly
  4. U.S. DOT Drug & Alcohol Testing Regulations
  5. NCSL Marijuana Laws by State

Laws change often. This page is general information, not legal advice. Check official state agencies or consult legal counsel for current requirements.

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Testing employees in Missouri?

Call the office to set up a compliant program, or schedule onsite collections.

Office601-602-2445 Onsite601-633-7733
Visit1520 Adeline St, Ste. 20, Hattiesburg, MS 39401