Proposition 64 would allow Californians who are 21 and older to
   possess, transport and use up to an ounce of cannabis for recreational
   purposes and allow individuals to grow as many as six plants.

   The measure would also impose a 15% tax on retail sales of the drug.
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   track who is bankrolling the effort.

   The biggest individual donor, by far, is former Facebook
   presidentParker, who has contributed $8.5 million to the cause through
   various committees. Parker has declined interview requests, but Kinney
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   “As the opposition well knows, the vast majority of our funding comes
   from organizations and individuals who care deeply about social justice
   and ending the failed war on marijuana and have zero interest
   whatsoever in the marijuana industry,” Kinney said.