Okla. Admin. Code § 35:37-3-18
The operator of each official establishment shall inform the Inspector in Charge, or his assistant, when work in each department has been concluded for the day and hour when work will be resumed therein. Whenever any product is to be overhauled or otherwise handled in an official establishment during unusual hours, the establishment operator shall, a reasonable time in advance, notify the Inspector in Charge or the Inspector's assistant, of the day and hour when the work will be commenced and the products shall not be handled prior to that time and except after notice has been given. No department of an official establishment in which are conducted operations requiring inspection shall be operated except under the supervision of a Division employee. All slaughtering of livestock and preparation of products shall be done within reasonable hours, and with reasonable speed, the facilities of the establishment being considered.
Okla. Admin. Code § 35:37-3-18