“…The only other exclusion criteria were being dis-enrolled in school between referral and the start of the intervention. Project READY has demonstrated effectiveness in reducing marijuana use and consequences up to 16 weeks postintervention in several studies (Serafini, Shipley, & Stewart, 2015;Stewart, Arlt, Felleman, Athenour, & Arger, 2015;Hall, Stewart, Arger, Athenour, & Effinger, 2014) Participants consisted of 262 students from five high schools in the greater Seattle area. Of the 262 participants, 55% were male and 36% were females.…”