poisonous or toxic materials must be:

(1) Used according to:

(a) law and this chapter;

(b) Manufacturer's use directions included in labeling, and, for a pesticide, manufacturer's label instructions that state that use is allowed in a food establishment;

(c) The conditions of certification, if certification is required, for use of the pest control materials; and

(d) Additional conditions that may be established by the regulatory authority; and

(2) Applied so that:

(a) A hazard to employees or other persons is not constituted; and

(b) Contamination including toxic residues due to drip, drain, fog, splash or spray on food, equipment, utensils, linens, and single-service and single-use articles is prevented, and for a restricted use pesticide, this is achieved by:

(i) Removing the items;

(ii) Covering the items with impermeable covers; or

(iii) Taking other appropriate preventative actions; and

(iv) Cleaning and sanitizing equipment and utensils after the application.

(3) A restricted use pesticide must be applied only by an applicator certified as defined in 7 U.S.C. 136 Definitions, (e) Certified Applicator, of the Federal Insecticide, Fungicide and Rodenticide Act, or a person under the direct supervision of a certified applicator.