All members of the fumigating crew must be equipped with a serviceable mask of a type approved by the U.S. Mines, Safety, and Health Administration with correct canister for the type of gas used, and shall wear these masks while in the enclosed space during and after release of the gas, and until initial ventilation is completed. Appropriate antidotes shall be available during every fumigation.
Okla. Admin. Code § 35:30-17-84