This document provides an analysis of regulations and investigations related to bitcoin in the United States. It finds that bitcoin poses money laundering threats due to its anonymity. Current regulations from different agencies contradict each other and law enforcement tries to fit bitcoin exchanges under money service business rules. The document recommends defining bitcoin clearly under US law, passing new legislation specific to digital currency that addresses money laundering risks, applying money service business regulations to peer-to-peer bitcoin exchanges, and developing blockchain analysis tools to help law enforcement investigations.