Advocates for the legalization of marijuana celebrated a hard-won fight Jan. 1, when sales for recreational use began in Colorado, but one question remained: What will those who make and sell pot do with all their money? Now, some of Colorado’s congressional delegation want the Treasury and Justice departments to accelerate their review of the issue.

In a Friday letter to top officials at both departments, both the state’s senators and four of its seven representatives asked the federal government to give advice to Colorado’s marijuana businesses on how to access the banking system.

“In crafting such guidance, your respective agencies should work with the various banking regulators to ensure that these retail stores and dispensaries have some degree of access to the banking system,” they write. “At the same time, this guidance should include sufficient safeguards to ensure that access to the banking system will not facilitate any form of money laundering or other illegal activities.”

Read more: Colorado lawmakers to feds: Let marijuana businesses bank | Washington Post.