The first portion of the ABCD substance use protocol includes a brief introduction that operationalizes the term “drug use,” repeats that all answers are confidential, and then proceeds to ask the youth if they have heard of specific substances. The description of drug use, confidentiality, and substance use category wording was adapted for 9 and 10 year olds from existing national studies on substance use, including the Collaborative Studies on Genetics of Alcoholism (COGA; https://www.niaaa.nih.gov/research/major-initiatives/collaborative-studies-genetics-alcoholism-coga-study) (Bierut et al., 2002), National Survey on Drug Use and Health (NSDUH; https://nsduhweb.rti.org/) (Quality C.f.B.H.S.a., 2014), the PhenX Patterns of Substance Use module (module #510301) for adolescents, and the MTF Study (Institute for Social Research and U.o.M. Monitoring the Future, 2010).
