A number of states have legalized recreational and/or medical marijuana. Employers must adapt their policies in some manner, but the challenges goes deeper. Research has indicated a relationship between marijuana use and mental health issues.
— By Jeremiah Prince

Ten states have legalized recreational and medical marijuana as of May 2019, while 15 states chose to decriminalize marijuana and 33 states and Washington, D.C., legalized medical marijuana only. Any way the numbers are considered, most U.S. employers are challenged by changing cannabis laws that increase the likelihood of more marijuana use among employees.

In the new order of things, legalized cannabis can lead to employees making the false assumption their employer cannot maintain drug testing for cannabis. People using marijuana for medical purposes need accommodation like any person using legal prescribed drugs.

The final complication is the unknown definitive connec...