Commentary on Cunningham et al. (2015): Essential chemical controls-miracle from a black box?

In this article the author discusses the article "US Federal Cocaine Essential (‘Precursor’) Chemical Regulation Impacts on US Cocaine Availability: An Intervention Time–Series Analysis With Temporal Replication" by J. Cunningham, R. Callaghan and L. Liu, which appears within the issue. He is supportive of points which are raised in the article and of conducting additional research similar to research reported in the article to verify its conclusions.