(a) Original inspection service—(1) Official sample-lot inspection service. Each original inspection service shall be performed on the basis of one or more official samples obtained by official personnel from grain in the lot and forwarded to the appropriate agency or field office.

(2) Warehouseman's sample-lot inspection. Each original warehouseman's sample-lot inspection service shall be performed on the basis of samples obtained by a licensed warehouseman and sent to the appropriate agency or field office in whose circuit the warehouse is located.

(3) Submitted sample service. Each original submitted sample inspection service shall be performed on the basis of the sample as submitted.

(b) Reinspection, and appeal inspection services—(1) Official sample-lot inspection service. Each of these inspection services shall be performed on the basis of official samples as available, including file samples, at the time the service is requested. In performing these services, a sample obtained with an approved diverter-type mechanical sampler or with a pelican sampler generally shall be used with respect to quality factors and official criteria, and a sample obtained with a probe at the time of the reinspection or appeal, generally, shall be used with respect to heating, musty, sour, insect infestation, and other condition and odor factors. In instances where original inspection results are based on samples obtained by probe, the decision as to whether file samples or new samples obtained by probe are to be used shall be made by the official personnel performing the service.

(2) Warehouseman's sample-lot inspection service. Each reinspection service and appeal inspection service on a warehouseman's sample shall be performed on an analysis of the official file sample.

(3) Submitted sample service. Each reinspection service and appeal inspection service on a submitted sample shall be performed on an analysis of the official file sample.

(c) Board appeal inspection services. Board appeal inspection services shall be performed on an analysis of the official file sample.

(d) Use of file samples—(1) Requirements for use. A file sample that is retained by official personnel in accordance with the procedures prescribed in the instructions may be considered representative for a reinspection service, appeal inspection service, and a Board appeal inspection service if (i) the file sample has remained at all times in the custody and control of the official personnel that performed the inspection service in question; and (ii) the official personnel who performed the original inspection service and those who are to perform the reinspection, the appeal inspection, or the Board appeal inspection service determine that the samples were representative at the time the original inspection service was performed and that the quality or condition of the grain in the samples has not changed.

(2) Certificate statement. When the results of a reinspection, appeal inspection, or Board appeal inspection service are based on an official file sample, the certificate for the reinspection service, the appeal inspection service, and the Board appeal inspection service shall show a statement, as specified in the instructions, indicating that the results are based on the official file sample.