Substance use treatment; Detoxification; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Outpatient detoxification; Outpatient methadone/buprenorphine or naltrexone treatment; Regular outpatient treatment; Methadone used in Treatment; Buprenorphine used in Treatment; Naltrexone used in Treatment; Does not treat alcohol use disorder; Buprenorphine maintenance; Federally-certified Opioid Treatment Program; Methadone maintenance; Prescribes buprenorphine; Methadone; Buprenorphine with naloxone; Substance use disorder counseling; Private for-profit organization; State Substance use treatment agency; State mental health department; State department of health; Council on Accreditation (COA); Federal, or any government funding for substance use treatment programs; Medicaid; Cash or self-payment; Adult men; Seniors or older adults; Lesbian, gay, bisexual, transgender, or queer/questioning (LGBTQ); Veterans; Members of military families; Comprehensive substance use assessment; Screening for substance use; Drug or alcohol urine screening; TB screening; Discharge Planning; Naloxone and overdose education; Outcome follow-up after discharge; Mentoring/peer support; Employment counseling or training; Benzodiazepines Detoxification; Opioids detoxification; Medication routinely used during detoxification; Substance use disorder education; Individual counseling; Family counseling; Marital/couples counseling; Smoking permitted in designated area; Adults; Seniors; Young adults; Female; Male; Opioid use disorder clients only; Spanish; Vaping not permitted; Case management service; Mental health services; Social skills development