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I believe gravypod is referring to previous years in the graph that starts the article. For instance, look at the 2008-2012 period. There is a definite downward

• gravypod 9y ago
  Yes, exactly. To prove a correlation, in my opinion, one would need.... 1. More smoothed/averaged dataset (centered rolling average ~4 months?) 2. Explain the other extreme dips in this graph (2005, 2007, 2011) 3. Plot similar data from other states (with and without legal marijuana) 4. Investigate other causes (see sparrish's comment)