Substance use treatment; Outpatient; Outpatient methadone/buprenorphine or naltrexone treatment; Buprenorphine used in Treatment; Does not treat alcohol use disorder; Buprenorphine maintenance; Buprenorphine maintenance for predetermined time; Prescribes buprenorphine; Buprenorphine with naloxone; Anger management; Brief intervention; Cognitive behavioral therapy; Contingency management/motivational incentives; Relapse prevention; Substance use disorder counseling; Tribal government; SAMHSA certification for opioid treatment program (OTP); Medicaid; Comprehensive substance use assessment; Screening for substance use; Drug or alcohol urine screening; Aftercare/continuing care; Discharge Planning; Naloxone and overdose education; Housing services; Assistance with obtaining social services; HIV or AIDS education, counseling, or support; Substance use disorder education; Individual counseling; Group counseling; Smoking permitted without restriction; Adults; Young adults; Female; Male; Opioid use disorder clients only; Case management service; Transportation assistance