(a) A spaying or neutering deposit may be either of the following:

1. (1) A portion of the adoption fee or other fees rendered in acquiring the cat, which will enable the adopter to take the cat for spaying or neutering to a veterinarian with whom the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group has an agreement that provides that the veterinarian will bill the shelter directly for the sterilization.

2. (2) A deposit that is both of the following:

   1. (A) Refundable to the recipient if proof of spaying or neutering of the cat is presented to the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group not more than 30 business days after the date the cat is spayed or neutered.
   2. (B) Forfeited to the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group if proof of spaying or neutering is not presented to the animal shelter within 30 business days.

(c) All spaying or neutering deposits forfeited or unclaimed under this section shall be retained by the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group and shall be used by the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group only for the following purposes:

1. (1) A program to spay or neuter dogs and cats.
2. (2) A public education program to reduce and prevent overpopulation of dogs and cats, and the related costs to local government.
3. (3) A followup program to ensure that dogs and cats transferred by the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group are spayed or neutered in accordance with the agreement executed under subdivision (d) of Section 31760.
4. (4) Any additional costs incurred by the public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group in the administration of the requirements of this chapter.