http://www.taxrates.com/blog/2016/11/21/california-exempts-medical-cannabis/
http://report.saltcpa.com/2016/11/california-medical-cannabis-tax-exemption-has-begun/
http://www.boe.ca.gov/pdf/l486.pdf
http://news.cchgroup.com/2016/11/22/california-sales-use-tax-boe-reminds-taxpayers-medical-cannabis-tax-exemption-begun/