Other questions in this quiz

2. Roughly how much time was between each urine test

  • 2 months
  • 3 months
  • 2 weeks
  • 6 days

3. What was one of the behavioural rules?

  • Do not sell the prescribed drugs
  • Take daily urine tests
  • Do not drink any alcohol

4. Different questions were used each time an interview took place

  • False
  • True

5. 106 participants had...

  • stopped using cocaine by the end of the study
  • increased their heroin intake by the end of the study

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