California Code, Education Code - EDC § 8254

(a) The family fee schedule shall provide, among other things, that a contractor or provider may require parents to provide diapers.  A contractor or provider offering field trips either may include the cost of the field trips within the service rate charged to the parent or may charge parents an additional fee.  Federal or state money shall not be used to reimburse parents for the costs of field trips if those costs are charged as an additional fee.  A contractor or family childcare home provider that charges parents an additional fee for field trips shall inform parents, before enrolling the child, that a fee may be charged and that no reimbursement will be available.

(b) A contractor or family childcare home provider may require parents to provide diapers or charge parents for field trips, subject to all of the following conditions:

(c) A contractor or family childcare home provider shall establish a system that prevents the identification of children based on whether or not a child's family has paid field trip fees.

(d) The contractor or provider shall report expenses incurred and income received for field trips to the department.  Income received shall be reported as restricted income.