An impact evaluation showed a significant delay in the onset of alcohol use one year after the program's intervention. However, no impact of the program was found on the use of cigarettes or cannabis, attitude toward the police, coping strategies, attachment and commitment to school, or rebellious behavior [1].
A second impact evaluation found no statistically significant differences between students in the treatment group and students in the control group in overall substance use (cigarettes and alcohol), nor in students' attitude toward drug abuse or their levels of self-esteem two years after the intervention [2].
A third impact evaluation found no statistically significant differences between students in the treatment group and students in the control group either in overall substance use (cigarettes, alcohol, and cannabis) or in students' attitude toward drug abuse five years after the intervention [3].