B anks play a critical role in the United States economy, channeling money from savers to borrowers and facilitating productive investment. While the nature of lawmakers' interest in bank regulation has shifted over time, most bank regulations fall into one of three general categories. First, banks must abide by a variety of safety-and-soundness requirements designed to minimize the risk of their failure and maintain macroeconomic stability. Second, banks must comply with consumer protection rules intended to deter abusive practices and provide consumers with complete information about financial products and services. Third, banks are subject to various reporting , recordkeeping , and anti-money laundering requirements designed to assist law enforcement in investigating criminal activity. The substantive content of these requirements remains the subject of intense debate. However, the division of regulatory authority over banks between the federal government and the states plays a key role in shaping that content. In some cases, federal law displaces (or "preempts") state bank regulations. In other cases, states are permitted to supplement federal regulations with different, sometimes stricter requirements. Because of its substantive implications, federal preemption has recently become a "flashpoint" in debates surrounding bank regulation, with one commentator observing that preemption is "[t]he issue at the center of most disputes between state and federal banking regulators." Fourth, the report reviews two Supreme Court decisions concerning the extent to which states may exercise "visitorial powers" over national banks. Finally, the report outlines a number of current issues in banking preemption, including (1) the extent to which non-banks can benefit from federal preemption of state usury laws, (2) the OCC's decision to grant special purpose national bank charters to financial technology (FinTech) companies, and (3) proposals to provide legal protections to banks serving marijuana businesses that comply with state law. Specifically, the Supreme Court has held that the National Bank Act impliedly preempts state laws that "significantly interfere" with the powers of national banks. Under the contemporary dual banking system, the OCC serves as the primary regulator of national banks and has broad powers to regulate their organization, examination, and operations. 20th Century Developments: The Federal Reserve, the Federal Deposit Insurance Corporation, and the Convergence of Federal and State Regulation

While the OCC and state banking authorities figure prominently in the dual banking system, the Federal Reserve and the Federal Deposit Insurance Corporation (FDIC) also play important roles in the bank regulatory regime. The Federal Reserve accordingly serves as the principal federal regulator of state-chartered banks that become members of the FRS. The FDIC serves as the principal federal regulator of state-chartered banks that do not join the FRS. This complex regulatory architecture has resulted in "symbiotic system" with both state regulation of national banks and federal regulation of state banks. In the modern dual banking system, national banks are not wholly immune from generally applicable state laws, and state banks are not wholly immune from generally applicable federal laws. A number of other legal developments have caused the regulatory treatment of national banks and state banks to converge. Finally, in Wiersum v. U.S. Bank, N.A. Section 1044 provides that federal law preempts such laws only if: 
(A) application of a State consumer financial law would have a discriminatory effect on national banks, in comparison with the effect of the law on a bank chartered by that State;
(B) in accordance with the legal standard for preemption in the decision of the Supreme Court of the United States in [ Barnett Bank ], the State consumer financial law prevents or significantly interferes with the exercise by the national bank of its powers; and any preemption determination under this subparagraph may be made by a court, or by regulation or order of the Comptroller of the Currency on a case-by-case basis, in accordance with applicable law; or
(C) the State consumer financial law is preempted by a provision of Federal law other than title 62 of the Revised Statutes.
Banks play a critical role in the United States economy, channeling money from savers to borrowers and facilitating productive investment. While the nature of lawmakers' interest in bank regulation has shifted over time, most bank regulations fall into one of three general categories. First, banks must abide by a variety of safety-and-soundness requirements designed to minimize the risk of their failure and maintain macroeconomic stability. Second, banks must comply with consumer protection rules intended to deter abusive practices and provide consumers with complete information about financial products and services. Third, banks are subject to various reporting, recordkeeping, and anti-money laundering requirements designed to assist law enforcement in investigating criminal activity.
The substantive content of these requirements remains the subject of intense debate. However, the division of regulatory authority over banks between the federal government and the states plays a key role in shaping that content. In some cases, federal law displaces (or "preempts") state bank regulations. In other cases, states are permitted to supplement federal regulations with different, sometimes stricter requirements. Because of its substantive implications, federal preemption has recently become a flashpoint in debates surrounding bank regulation.
In the American "dual banking system," banks can apply for a national charter from the Office of the Comptroller of the Currency (OCC) or a state charter from a state's banking authority. A bank's choice of chartering authority is also a choice of primary regulator, as the OCC serves as the primary regulator of national banks and state regulatory agencies serve as the primary regulators of state-chartered banks. However, the Federal Reserve and the Federal Deposit Insurance Corporation (FDIC) also play an important role in bank regulation. The Federal Reserve supervises all national banks and state-chartered banks that become members of the Federal Reserve System (FRS), while the FDIC supervises all state banks that do not become members of the FRS. This complex regulatory architecture has resulted in a "symbiotic system" with both federal regulation of state banks and state regulation of national banks. In the modern dual banking system, national banks are often subject to generally applicable state laws, and state banks are subject to both generally applicable federal laws and regulations imposed by their federal regulators. The evolution of this system during the 20th century caused the regulation of national banks and state banks to converge in a number of important ways.
However, despite this convergence, federal preemption provides national banks with certain unique advantages. In Barnett Bank of Marion County, N.A. v. Nelson, the Supreme Court held that the National Bank Act (NBA) preempts state laws that "significantly interfere" with the powers of national banks. The Court has also issued two decisions on the preemptive scope of a provision of the NBA limiting states' "visitorial powers" over national banks. Finally, OCC rules have taken a broad view of the preemptive effects of the NBA, limiting the ways in which states can regulate national banks.
Courts, regulators, and legislators have recently confronted a number of issues involving banking preemption and related federalism questions. Specifically, Congress has considered legislation that would overturn a line of judicial decisions concerning the circumstances in which non-banks can benefit from federal preemption of state usury laws. The OCC has also announced its intention to grant national bank charters to certain financial technology (FinTech) companies—a decision that is currently being litigated. Finally, Congress has recently turned its attention to the banking industry's response to state efforts to legalize and regulate marijuana.