Medication-Assisted Treatment (MAT) uses medications, such as Methadone, in conjunction with behavioral therapy and counseling to treat opioid addiction. MAT with methadone is required to be distributed to individuals through an Opioid Treatment Program (OTP). MAT with methadone for opioid addiction is subject to federal law, with specific requirements such as physician evaluations, toxicology testing, counseling, and treatment planning. Some states go beyond what is required by the federal law and place stricter restrictions on OTPs, while other states simply defer to the federal law. This dataset examines federal and state laws that address the requirements of MAT with methadone.