Using these criteria and based on reported studies to date the Scott–Kaiser modification of the Peniston Protocol can also be classified as probably efficacious (Level 3) when combined with residential rehabilitation modalities in stimulant abusers. This rating is based on one controlled study of 121 subjects in which Peniston’s outcomes of both psychometric improvement and abstinence improvement were replicated (Scott et al. 2005) and one observational study of 71 subjects (Burkett et al. 2003).
