California Vehicle Code Section 13803

(a) The department shall conduct a reexamination, including a demonstration of the person`s ability to operate a motor vehicle as described in Section 12804.9, to determine whether the driving privilege of any person to operate a motor vehicle should be suspended or revoked, or whether terms or conditions of probation should be imposed upon receiving information from any member of the vehicle operator`s family within 3 degrees of consanguinity, or the operator`s spouse, who has reached 18 years of age, except that no person may report the same family member pursuant to this section more than one time during a 12-month period. (b) The report described in subdivision (a) shall state that the person filing the report reasonably and in good faith believes that the operator cannot safely operate a motor vehicle. The report shall be based upon personal observation or physical evidence of a physical or medical condition that has the potential to impair the ability to drive safely, or upon personal knowledge of a driving record that, based on traffic citations or other evidence, indicates an unsafe driver. The observation or physical evidence, or the driving record, shall be described in the report, or the report shall be based upon an investigation by a law enforcement officer. (c) No person who makes a report in good faith pursuant to this section shall be civilly or criminally liable for making that report. (d) This section shall remain in effect only until January 1, 2011, and as of that date is repealed, unless a later enacted statute, that is enacted before January 1, 2011, deletes or extends that date.