As more jurisdictions consider tolerating, decriminalizing, or even legalizing the recreational use of marijuana, and as more people are granted licenses for the medicinal use of the drug, the greater is the likelihood that marijuana use will impact any individual workplace. Employees under the influence of marijuana can create a host of workplace issues, from decreased productivity to safety hazards. The best approach for an employer is to be proactive to have a plan in place for preventing problems and responding to them if, and when, they occur.