Which of the Following Was Not a Finding in Higgins

Multiple Choice

Which of the following was not a finding in Higgins and colleagues study of the effectiveness of voucher programs for drug treatment and abstinence?

A) Participants in the community reinforcement approach plus vouchers group had a higher percentage of drug free tests than the CRA group
B) Both behavioral programs achieved higher 24-month abstinence rates than the traditional 12-step programs
C) The large difference between the CRA plus vouchers group and the CRA alone group was maintained throughout the entire 24-weeks of the program
D) Despite the high initial outcomes, the decrease in abstinence over the 24-week period and the high costs of the CRA plus vouchers program limit its usefulness