Sunghoon Roh and Matthew Robinson (both government and justice studies) co-authored an article in the Journal of Drug Issues, Volume 38(2): 467-492.  The article, “Assessing the ‘Gateway Hypothesis’ Among Middle and High School Students in Tennessee,” found no evidence to support the argument that early marijuana use causes later “hard” drug use. The article also was co-authored with Tae Choo from Middle Tennessee State University.