This is based on the number of localities entered for mineral species and is therefore slanted towards minerals interesting to collectors with less coverage of common rock-forming-minerals so it does not give an undistorted distribution of Oxygen mineral species.
It has been legal to grow medical marijuana since 2010 in Arizona, which has about 88,000 patients qualified to obtain it from state-approved dispensaries. Patients must live more than 25 miles from a dispensary to grow their own pot. But there is a move to put a proposal to legalize marijuana on the ballot in 2016.
That's why other states should follow the example of Colorado and Washington and legalize the recreational use of marijuana. Harnessing the power of entrepreneurs is much more productive than fighting it. On January 1, Colorado legalized the sale of small amounts of marijuana for recreational use. Later this year, Washington will follow suit. Alaska, Arizona, California, D.C. and Oregon may be the next states to permit cannabis businesses.