Gov. John Kasich signed House Bill 523 into law this month, making Ohio the 25th state to legalize medical marijuana. The law goes into effect 90 days after the bill is officially filed with the secretary of state, making medical marijuana use in Ohio legal sometime in early September. The Ohio law prohibits smoking or growing marijuana at home but allows cannabis oils, tinctures, patches, edibles and plant material to be used to treat a variety of conditions and sold in state-licensed dispensaries. Patients will have an affirmative defense against prosecution for marijuana possession charges if they have written permission from their doctor to use marijuana in a form allowed under the law. Employers will need to review their policies, but under many circumstances may still discipline or terminate employees using medical marijuana at the workplace. Now is the time to dust off your handbooks and policies to address this new law.