The second draft of the Arizona Department of Health Services medical marijuana rules apparently divided Arizona into 126 areas where dispensaries can be located.  These areas are called “Community Health Analysis Areas (CHAAs).”  See the map of the CHAAs.  Read DHS Director Will Humble’s January 28, 2011, explaination of CHAAs in which he states:

“Several years ago, our public health statistics team divided the State into 126 Community Health Analysis Areas to help us analyze data for various disease monitoring programs.  The initial trigger to develop the CHAAs was a 1988 law that directed the ADHS to use the data in the cancer registry to identify areas and populations that need investigation.”