No tax revenue from marijuana grown in corn fields or in homes

According to a recent story about a group of people who were arrested for growing marijuana in a corn field near Yakima, "the suspects reportedly told the agents they had medical marijuana cards, but card holders are limited to only 1½ pounds of marijuana . . ."

Initiative 502 allows individuals to buy up to one ounce of marijuana, 16 ounces of marijuana infused products in solid form, or 72 ounces of marijuana infused product in liquid form.  What if people who use marijuana decide that this is not enough?

Many people who support I-502 say it will bring in much needed tax revenue.  But to gain that revenue, users must be willing to buy marijuana in stores.  Taxes cannot be collected on marijuana grown in homes or in corn fields not licensed by the Liquor Control Board.  Marijuana is cheap and easy to grow and it is unclear how the law against home grows and non-licensed farms will be enforced if I-502 is approved.