California Code, Government Code - GOV § 3308

No public safety officer shall be required or requested for purposes of job assignment or other personnel action to disclose any item of his property, income, assets, source of income, debts or personal or domestic expenditures (including those of any member of his family or household) unless such information is obtained or required under state law or proper legal procedure, tends to indicate a conflict of interest with respect to the performance of his official duties, or is necessary for the employing agency to ascertain the desirability of assigning the public safety officer to a specialized unit in which there is a strong possibility that bribes or other improper inducements may be offered.