U.S. Senator Barbara Boxer of California is a co-sponsor of a bipartisan bill to end the federal prohibition on medical marijuana, federal records show. The Washington Post reports that Boxer’s office did not announce her support of the bill when it was introduced last week.

The Compassionate Access, Research Expansion and Respect States (CARERS) Act would reclassify marijuana from Schedule I to Schedule II under the Controlled Substances Act. Schedule I drugs, which include heroin, have no accepted medical use in the United States. Schedule II drugs have a legitimate medical use but also have a high potential for abuse.

“Senator Boxer is a strong supporter of California’s medical marijuana law and she believes that patients, doctors and caregivers in states like California should be able to follow state law without fear of federal prosecution,” Zachary Coile, Boxer’s communications director, said in a statement.

The bill was introduced by Cory Booker of New Jersey and Kirsten Gillibrand of New York, both Democrats, and Rand Paul of Kentucky, a Republican.

The bill would permit Veterans Affairs doctors to prescribe medical marijuana to veterans, and would make it easier for scientists to obtain marijuana for medical research. It would allow banks and credit unions to provide the same services to the marijuana industry as they do to other businesses, without the fear of federal prosecution or investigation.

Because marijuana is still illegal under federal law, banks have been reluctant to conduct business with marijuana-related companies. Banks have feared being accused of helping these businesses launder their money.

The measure would not legalize medical marijuana in all 50 states, but would prevent federal law enforcement from prosecuting patients, doctors and caregivers in states that have their own medical marijuana programs. Currently 23 states plus the District of Columbia have legalized medical marijuana.