Tax policies vary from state to state. Currently, 33 states, Washington DC and four US territories have decriminalized cannabis. While some countries impose taxes on both recreational and medicinal marijuana, in others, medicinal marijuana is tax-free, implying you provide correct paperwork.
Another issue is the banks, as most of them take their cues from the federal government, and don’t accept cash earned from marijuana retail, regardless of whether it's medical or adult-use.