Section 1205.33 - Certification testing(a)General. Manufacturers and importers shall either test each individual rotary walk-behind power lawn mower (or have it tested) or shall rely upon a reasonable testing program to demonstrate compliance with the requirements of the standard.(b)Reasonable testing program.(1) A reasonable testing program for rotary walk-behind power mowers is one that provides reasonable assurance that the mowers comply with the standard. Manufacturers and importers may define their own reasonable testing programs. Such reasonable testing programs may, at the option of manufacturers and importers, be conducted by an independent third party qualified to perform such testing programs.(2) To conduct a reasonable testing program, the mowers shall be divided into production lots. Sample mowers from each production lot shall be tested in accordance with the reasonable testing program so that there is a reasonable assurance that if the mowers selected for testing meet the standard, all mowers in the lot will meet the standard. Where there is a change in parts, suppliers of parts, or production methods that could affect the ability of the mower to comply with the requirements of the standard, the manufacturer should establish a new production lot for testing.(3) The Commission will test for compliance with the standard by using the test procedures contained in the standard. However, a manufacturer's reasonable testing program may include either tests prescribed in the standard or any other reasonable test procedures. (For example, in the shield strength test (§ 1205.4 ), the manufacturer might choose to use a force higher than the 50 lb force specified in the standard.)(4) If the reasonable testing program shows that a mower does not comply with one or more requirements of the standard, no mower in the production lot can be certified as complying until the noncomplying mowers in the lot have been identified and destroyed or altered by repair, redesign, or use of a different material or components to the extent necessary to make them conform to the standard. The sale or offering for sale of mowers that do not comply with the standard is a prohibited act and a violation of section 19(a)(1) of the CPSA, regardless of whether the mower has been validly certified.