The Financial Crimes Enforcement Network (FinCEN), a bureau of the U.S. Department of the Treasury, administers and issues regulations pursuant to the Bank Secrecy Act (BSA).
Through certain BSA reporting and recordkeeping requirements, paper trails of transactions are created that law enforcement and others can use in criminal tax and regulatory investigations.
The reporting and recordkeeping provisions of the BSA apply to banks, savings and loans, credit unions and other depository institutions (collectively referred to as "banks") and to other businesses defined as financial institutions, including casinos, brokers and dealers in securities, and money services businesses (collectively referred to as "non-banks").
BSA regulations require certain Money Services Businesses (MSBs) to register with FinCEN and prepare and maintain a list of agents, if any. In addition, BSA regulations require certain MSBs to report suspicious activity to FinCEN.