This is old news by now, but Motivational Interviewing and Motivational Enhancement Therapy have received the NREPP seal of approval as evidence-based practices in substance abuse treatment.
The National Registry of Evidence-based Programs and Practices (NREPP) is a searchable online registry of mental health and substance abuse interventions that have been reviewed and rated by independent reviewers. The purpose of the registry is to assist the public in identifying approaches to preventing and treating mental and/or substance use disorders that have been scientifically tested and that can be readily disseminated to the field. NREPP is a program of the US Department of Health and Human Services Substance Abuse and Mental Health Services Administration (SAMHSA).
NREPP review of Motivational Interviewing
NREPP review of Motivational Enhancement Therapy