This document summarizes various legal issues facing the marijuana industry. Federal law currently prohibits marijuana under the Controlled Substances Act, though some states have legalized it, creating a conflict. Federal memos have taken a lighter enforcement approach but do not prevent prosecution. Banks avoid the industry due to money laundering laws. Tax laws also pose challenges, as businesses cannot deduct normal expenses. States have established regulatory regimes for licensing businesses but face pushback from localities and landlords. Trademarking of brands could help the industry expand if federal law changes.