Cal. Health and Safety Code § 114039.4

(a) Except as specified by subdivision (b), shellstock tags shall remain attached to the container in which the shellstock are received until the container is empty. (b) The identity of the source of shellstock that are sold or served shall be maintained for 90 calendar days from the dates of harvest by using an approved recordkeeping system that keeps the tags or labels in chronological order correlated to the date or dates the shellstock are sold or served. (c) Notwithstanding subdivision (b), if shellstock are removed from their tagged or labeled container, the identity of the source of shellstock that are sold or served shall be maintained by doing the following: (1) Using a recordkeeping system as required under subdivision (b). (2) Ensuring that shellstock from one tagged or labeled container are not commingled with shellstock from another container with different certification numbers, harvest dates, or growing areas as identified on the tag or label before being ordered by the consumer. (3) If shellstock are portioned and prepackaged, including a copy of the corresponding shellstock tag or properly labeling the package with the required shellfish information.