Cal. Code Regs. tit. 17, § 12685 – Sampling Canned Tuna.

(a) The supervising cannery inspector in charge of the district shall determine whether or not sample cans of the final product shall be taken for examination. He shall base his decision upon the condition of the boat load and the report of the inspector. If the boat load of fish is in a prime state of preservation at the time of packing, confirmed by inspection in the plant, no samples need be taken.
(b) Sampling shall be carried out according to rules promulgated by the Department of Public Health and the minimum quantities of samples shall be as follows:
A lot of less than 200 cases
48 cans
200 to 1,000 cases
96 cans
1,000 to 2,000 cases
192 cans
2,000 to 5,000 cases
288 cans
5,000 to 10,000 cases
576 cans
Over 10,000 cases
960 cans
Not more than one can should be taken from any one case in sampling.