What counts as ‘medical marijuana’ varies from state to state – and that’s a problem

On April 17, Pennsylvania became the latest state to pass medical marijuana legislation, which will take effect this month. And recently Ohio's House of Representatives has passed a plan to permit medical marijuana in the state.

On April 17, Pennsylvania became the latest state to pass medical marijuana legislation, which will take effect this month. And recently Ohio's House of Representatives has passed a plan to permit medical marijuana in the state.…