The plain fact is most dispensaries follow California's model because California has been doing it the longest and it's a (somewhat) stable model.
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Zero effect? Is it really worth growing a 25 plant crop, getting busted by the Butte county sheriff then relying on an attorney to fight the charges to keep you out of jail because the county ordinances violate state law? Butte county is not the only one to snub their noses at state law and the supreme court rulings and there are already people becoming sacrifical lambs challenging the legal system but most people do not have these resources.

Mendocino county passed a new ordinance increasing the size of a crop a person can grow to I believe 100 plants but has to be registered with the county and permitted. The first woman to attempt to pacify this ordinance by getting a permit and starting her crop was busted by the DEA. State law does not trump federal law, local laws do not trump state laws and no matter how you look at it this "industry" is completely unregulated and there are no checks and balances. AB 420 was supposed to clarify the ambiguity of prop. 215 but even many member of law enforcement don't know the specifics. If your neighbor sees you growing 50 plants and calls the sheriff, they can easily show up, confiscate your crop and disregard any supreme court rulings leaving you to waste your own resources to defend yourself which you may do successfully but at what cost?

You think pot clubs are a stable model? You are kidding me right? The reason cities and counties are cracking down is because of the ambiguity in these regulations(or lack there of totally). Right now as we are speaking the IRS is starting to really scrutinize these shops, they are supposed to be part of a co-op and NON PROFIT! If you have ever belonged to a true co-op then you would know they supply whatever the product is at a reasonable cost produced from a number of different sources, the co-op can charge enough to cover overhead and any extra profit is/should be divided up among current members. Pot shops are also supposed to be involved in the growing process and most aren't, they are buying wholesale at very low prices and marking their product up 200-300%. The same pot people are paying $50+ and 8th for in clubs I can get for under $150 an oz from a true co-op and pass that cost on to my other friends who have recommendations. Prop. 215 was supposed to be a compassionate law to help people who otherwise might face prosecution for using/growing cannabis for medical uses, the key word here is compassionate and there is nothing compassionate about charging $50 an 8th for "medication".