CA Food & Agric Code Section 26008

(a)

It is unlawful for any person to sell any whole carcass of chicken poultry meat unless such carcass, or the immediate package or other container in which it is sold, is plainly, legibly, and conspicuously labeled, stamped, tagged, or branded to show the name and address of the poultry plant where the chicken was slaughtered or the name of the state in which the chicken was grown or raised.

(b)

Chicken poultry meat which is sold to institutions, to restaurants, or to processors for processing, may bear the label which is required in subdivision (a) of this section on each shipping container in lieu of individual carcass labeling.