Even as support for ending marijuana prohibition is building around the country, Congress and the Obama administration remain far too timid about the need for change.

Last year, residents in Alaska, Oregon and the District of Columbia voted to join Colorado and Washington State in making recreational use of marijuana legal. Later this year, residents of Ohio are expected to vote on a ballot measure that would legalize it. Nevadans will vote on a legalization proposal next year. And Californians could vote on several similar measures next year.

Instead of standing by as change sweeps the country, federal lawmakers should be more actively debating and changing the nation’s absurd marijuana policies, policies that have ruined millions of lives and wasted billions of dollars. Their inaction is putting businesses and individuals in states that have legalized medical and recreational marijuana in dubious legal territory — doing something that is legal in their state but is considered a federal crime. Many growers, retailers and dispensaries also have to operate using only cash because many banks will not serve them, citing the federal prohibition. Recently, the Federal Reserve denied a master account to a credit union in Colorado seeking to provide financial services to marijuana businesses.

Lawmakers who hope their colleagues in Congress will act face an uphill struggle. For example, a bill introduced in the Senate by Cory Booker and Kirsten Gillibrand, Democrats of New Jersey and New York, respectively, and Rand Paul, Republican of Kentucky, would allow states to legalize marijuana for medical use. It would also allow banks and credit unions to provide financial services to cannabis-based businesses in states that have legalized the drug. The bill has 16 sponsors, including two Republicans, but the Judiciary Committee, which is chaired by Charles Grassley, Republican of Iowa, has not scheduled it for a hearing or a vote. An identical bill in the House with 17 sponsors, eight of them Republican, is also languishing in committee.