purposefully abusing OTC DXM products (Johnston et al., 2017). Cough medicine will be measured in occasions (max use in ml) and visual aids with various types of OTC cough or cold medicine will be provided to assist with max dose information.20.Over-reporting Validity Check. During the “ever used” and 6-month TLFB questions, we added a bogus drug category with two made-up substances to assess potential over-responding. If a youth answers “yes” to the bogus category, the research assistant will give them a few moments, and then remind the youth about confidentiality and the need for accurate responding. Youth are allowed to alter any information after this prompt.
