Acceptance of employee marijuana use means increased accidents and injuries, loss of workplace productivity, increased workers' compensation claims, and employee turnover, to name a few problems (National Institutes of Health). These losses have real dollar value that impacts small-business owners considerably. Ultimately, the most costly battles will be fought in the courts at the employers' expense. Weakening or removing employers' rights for a safe and drug free workplace ultimately threatens all of us.
Links
[1] https://ohsonline.com/Articles/2016/02/01/Trends-in-Marijuana-Legalization.aspx?Page=2
[2] http://www.rethinkpot.org/tags/employer
[3] http://www.rethinkpot.org/tags/employees
[4] http://www.rethinkpot.org/tags/drug-free-workplace