After Colorado voters approved the sale and use of medicinal and recreational cannabis, the state's landscape was changed. Suddenly, dispensaries and grow houses were everywhere, and customers numbered in the tens, if not hundreds, of thousands. But federal laws make it difficult for cannabis businesses to open checking or savings accounts in federally insured financial institutions. It's nearly impossible for these businesses to wire funds, access lines of credit, or maintain payroll accounts. The result is an industry that has been forced to pay its bills, employees, suppliers, and taxes in cash. Briefcases and backpacks full of cash. Enter Safe Harbor Private Banking. Concerned about the risks a cash-based industryposes to public safety, it plunged into cannabis banking determined to take money off the streets and to offer law-abiding businesses a port in a turbulent sea. Its experiences serving the cannabis industry offer a primer for other bankersconsidering a similar program and for policy makers and regulators eager to bringstability to a topsy-turvy marketplace.