Cal. Bus. & Prof. Code § 26230

The association and its members may make and execute marketing contracts that require the members to sell, for any period of time, but not over 15 years, all or a specified part of a cannabis product exclusively to or through the association, or a facility that is created by the association. If the members contract a sale to the association, title to the cannabis product passes absolutely and unreservedly, except for recorded liens, to the association upon delivery or at another specified time that is expressly and definitely agreed in the contract.