As briefly described above, until youth have access to private personal mobile devices (typically around age 12), youth and their parents will be called every six months (so at 6 months, and 18 months). First the youth are reminded about confidentiality and asked if they are in a private, quiet place where no one else can hear the conversation. Next, “heard of” questions are repeated for alcohol, cannabis products, nicotine products, inhalants, prescription anxiolytics, prescription stimulants, prescription opiates, OTC cough medication, and “anything else to make you feel high”. If they have heard of a substance, they are asked if they have used that substance within the past 6-months, past month or past week to track recent onset of new substances between in-person assessments. Because youth are likely to be using parent phones, response options are limited to yes/no format to maximize privacy. Once youth have access to mobile technology that they can use privately (typically by age 12), the initial 6-month and 18-month phone interview will be replaced with a more detailed 6-month TLFB interview (covering all aforementioned drug categories in section C.3) will be administered by research staff directly with the adolescent via web and/or personal cell phone.
