The Effects of Federal Parity on Substance Use Disorder TreatmentBySusan H. Busch, PhD,Andrew J. Epstein, PhD,Michael O. Harhay, MPH,David A. Fiellin, MD,Hyong Un, MD,Deane Leader Jr, DBA, MBA,Colleen L. Barry, PhD, MPPJanuary 23rd 2014Federal parity led to an increase in spending on substance use disorder treatment.