California Code, Government Code - GOV § 53216

The legislative body of a local agency may establish a pension trust funded by individual life insurance contracts, individual annuities, group policies of life insurance, or group annuities, or any one or combination of them, or by any other investment authorized by this article for the benefit of its officers and employees.

The legislative body of a local agency may make participation in any plan under such pension trust optional with the officers and employees of the local agency or it may make participation in such pension trust plan compulsory for the officers and employees of such agency.

Officers and employees who participate in such pension trust plan, whether it is optional or compulsory, shall have their plan contributions deducted from their compensation.