California Code, Code of Civil Procedure - CCP § 490.010

(a) The levyunder a writ of attachment or the service of a temporary protective order in an action in which attachment is not authorized, except that it is not a wrongful attachment if both of the following are established:

(b) The levyunder a writ of attachment or the service of a temporary protective order in an action in which the plaintiff does not recover judgment.

(c) The levy under writ of attachment obtained pursuant to Article 3 (commencing with Section 484.510) of Chapter 4 or Chapter 5 (commencing with Section 485.010) on property exempt from attachment except where the plaintiff shows thatthe plaintiff reasonably believed that the property attached was not exempt from attachment.