Congress took a step toward easing its stance on medical marijuana on Thursday.

U.S. Sens. Rand Paul (R-Kentucky), Corey Booker (D-New Jersey) and Kirsten Gillibrand (D-New York) introduced a bill that would end the federal prohibition of medical marijuana and take steps to improve research.

The Compassionate Access, Research Expansion and Respect States, or CARERS, Act would effectively change the Controlled Substances Act, allowing the possession, production and distribution of medical marijuana in states with established marijuana laws.

Twenty-nine states, as well as the District of Columbia, have already legalized marijuana, but the CARERS Act would prevent the federal government from prosecuting businesses and individuals in states where medical marijuana is legal, since federally marijuana is still illegal under the Controlled Substances Act.

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“The reintroduction of the CARERS Act is the first of many steps we hope this Congress will take to end the federal prohibition of medical marijuana,” Don Murphy, director of conservative outreach for the Marijuana Policy Project, said in a statement. “Polls show overwhelmingly strong support for medical marijuana, and it spans the political spectrum.

“The federal government should not be meddling in state laws that allow it or obstructing research into its many medical benefits.”

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The introduction of the bill comes days after news that Attorney General Jeff Sessions wrote a letter to leaders of Congress asking that they undo protections for the industry under the Hinchey-Rohrabacher Amendment. That amendment, which is tied to the federal appropriations bill, prevents the Justice Department from using federal funds to enforce federal prohibition in states with legal marijuana laws.

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The act, which was first introduced in 2015, would also allow doctors to recommend medical marijuana to veterans in states where its legal and it would give researchers more access to cannabis to conduct studies, which has been an issue in the industry.

Marijuana is made up of a multitude of cannabinoids — the two most prominent being tetrahydrocannabinol (THC) and cannabidiol (CBD). While THC is the main psychoactive component, researchers believe CBD has potential medical uses. The CARERS Act would remove CBD from the Drug Enforcement Administration’s list of Schedule I drugs, according to Leafly, which would allow states to import it.