California Code, Business and Professions Code - BPC § 17510.87

Any individual, corporation, or other legal entity who, for compensation, solicits funds or other property in this state for charitable purposes is prohibited from retaining more than 50 percent of the net proceeds collected as a fee for fundraising services.  For purposes of this section only, a fee does not include a flat fee agreed upon prior to the initiation of direct solicitation that is associated with the development of a solicitation or marketing campaign for charitable purposes.

A violation of this section shall not be a crime.  However, it is subject to all applicable civil remedies.  In addition, any person who collects any fee in excess of the limits imposed by this section shall be subject to a penalty in the amount of the excess fee, which penalty may be collected in an action by any person authorized to bring an enforcement action under Chapter 5 (commencing with Section 17200) and distributed as provided in that chapter.

This section shall only apply to contracts entered into or renewed on or after January 1, 1995.