California Code, Revenue and Taxation Code - RTC § 2953

Property shall not be seized or sold in satisfaction of taxes on unsecured property until after the date such taxes become delinquent, unless the tax collector first determines that seizure prior to that date is necessary because there is a great probability that the taxes will not be collectible after the delinquency date due to the financial condition of the taxpayer or other suitable reason, and prior to the seizure files a written declaration under penalty of perjury with the clerk of the board of supervisors setting forth the grounds and necessity for such seizure.

The tax collector shall deliver a copy of the declaration to the assessee at the time of seizure.