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Drugs, Alcohol and Smoking: Missouri

Drugs, Alcohol and Smoking requirements for other states

Federal law and guidance on this subject should be reviewed together with this section.

Author: XpertHR Editorial Team


  • Missouri employers may discipline employees for alcohol and drug use at work. See Drugs and Alcohol.
  • Missouri permits the use of medical marijuana by qualified registered users with a qualifying medical condition. See Medical Marijuana.
  • Employers may implement and enforce policies that prohibit the use, sale, possession, distribution, purchase and cultivation of drugs and alcohol in the workplace. See Drug and Alcohol Policies.
  • The state's Employment Security Law regulates drug and alcohol testing to establish employee misconduct connected with a claim for unemployment benefits. See Drug and Alcohol Testing.
  • Missouri's Indoor Clean Air Act prohibits smoking in public places, which includes workplaces. See Smoking.
  • An employer must make reasonable efforts to prevent smoking in the workplace by posting appropriate signs. See Postings.
  • Employers are not required to have a smoking policy but may implement one that prohibits smoking in the workplace. See Smoking Policies.