This document discusses banking regulations and compliance considerations for cannabis businesses. It summarizes the Cole Memorandum which provided guidelines for federal and state marijuana enforcement priorities. It also outlines FinCEN guidance for how banks can legally service state-legal marijuana businesses by following best practices like verifying licenses, ongoing monitoring, and SAR reporting. While the Cole Memo was rescinded in 2018, federal regulators are still applying FinCEN's rules and not taking enforcement actions, so banks can currently service the marijuana industry following these guidelines.