California Code, Civil Code - CIV § 1785.21

(a) A user in its discretion may notify the consumer that upon request the user may contact the consumer reporting agency and request that the consumer reporting agency investigate the current status of an item or items of information contained in the consumer report if the consumer disputes the completeness or accuracy of an item or items of information as provided to the user.

(b) The consumer credit reporting agency may require identification from the user to insure the validity of the request and, in that regard, may require that the request be put in writing with proper identification.

(c) In the event that any such request is made and identification given in the form or manner demanded by the consumer credit reporting agency, such agency shall review the file of the consumer and report the current status of the disputed information to the user and the consumer by the most expeditious means possible.

(d) No user who furnishes information pursuant to this section shall be liable to any person for furnishing such information.