You can find the Cannabis Problems Questionnaire--along with its scoring information, reliability, and validity--in this article that describes the questionnaire's development:
Jan Copeland, Stuart Gilmour, Peter Gates, Wendy Swift, The Cannabis Problems Questionnaire: Factor structure, reliability, and validity, Drug and Alcohol Dependence, Volume 80, Issue 3, 12 December 2005, p. 313-319.
You can get the full text article by searching the journal title (Drug and Alcohol Dependence) in the Library's Journals list http://qb9ty5ch5h.search.serialssolutions.com/. From the search results, choose the Science Direct Journals link to the online content then navigate to the year/volume/issue you need from the issue list on the left.
A nicely formatted handout of the questionnare is available online at http://ncpic.org.au/static/pdfs/assessment-tools/cannabis-problems-questionnaire.pdf. However, this link contains only the questionnaire itself; for scoring information, you will need to consult the article cited above.
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