Who can apply pesticides in a food service establishment?

Question: Who can apply pesticides in a food service establishment?

Always refers to one's pesticide tolerance. Such as 1. The number of pests killed by a chosen dose of insecticide. 2. By the amount of a pesticide that is applied to a food, and the amount of insecticide that is allowed to get on the food. 3. The ability of the liver to detoxify a pesticide. 4. Insecticide poisoning occurs in the laboratory.