Further research and developments regarding screening instruments are required in order to improve the assessment of cannabis-related problems. As mentioned earlier, at least CUDIT may need some revision because of the very weak performance of several items in psychometric analyses. Additional research should evaluate the usefulness of screening scales in different settings and for sub-populations of particular interest. With regard to adolescents, current projects in France and Spain investigate the performance of CAST in different samples. In Australia, attempts are made to develop a new screen intended to identify current and potential problems related to cannabis use on population level.
