Growing on more than 1 recommendation on the same property?

I remember a ruling, can't think of the name right now, that ruled it was legal for people to grow collectively on their property.
So if someone I know has some property (Shasta County) and is growing 6 plants for himself, would it be legal for him to grow off his friends recommendations, their 6 plants. Each set of 6 plants would be fenced off and have a locked gate, with another wooden fence around that whole area. The recommendations posted along with a month to month lease agreement stating each friend is renting that section of property in order to grow their medicine.
I know the caregiver thing has pretty much been decided that to be a caregiver, you must live with the person and be a primary care giver, so that is out the window.
I told him to look into getting a collective business license, but he's right about that being a bunch of hassle and possibly giving the state enough probably cause to come check him out whenever they want.

Whats the consensus on how to operate? Anyone know the names involved in the ruling that allowed patients to grow collectively?