Cannabis supply into and within Australia / Australian Institute of Criminology, July 2008
http://www.aic.gov.au/publications/ncpic/cjb002.pdf
Criminal Justice Bulletin: Series 2
"The supply of cannabis within Australia and how law enforcement tackles this is growing in complexity. Despite a plethora of research about cannabis, there are still clear gaps in knowledge, particularly in terms of both the changing nature and level of domestic cannabis supply. Ongoing research is required in each of these areas to adequately inform the decisions of law enforcement, the courts and policymakers."