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Included in the end-of-year appropriations bill that President Biden signed on December 29, 2022 was the bipartisan Mainstreaming Addiction Treatment (MAT) Act of 2023. This act eliminates the so-called X-waiver that physicians had long needed to prescribe buprenorphine, a medication that curbs opioid cravings, reduces drug use, and prevents deaths among people who use opioids.