This document summarizes a law review article about the challenges faced by marijuana businesses in obtaining banking services due to federal anti-money laundering laws. It provides background on how federal laws prevent banks from handling proceeds from drug trafficking, even as some states have legalized marijuana. This creates problems for marijuana businesses that have to operate as cash-only businesses. The summary discusses security, accounting and tax issues that arise from a lack of banking access. It analyzes the ramifications of banks enforcing federal laws against money laundering on marijuana businesses.