This document amends the Customs and Border Protection Regulations in order to establish rules and procedures under the Product Development and Testing Act of 2000 (PDTA). The purpose of the PDTA is to promote product development and testing in the United States by allowing the duty-free entry of articles, commonly referred to as prototypes, that are to be used exclusively in product development, testing, evaluation or quality control. The final regulations set forth the procedures for both the identification of those prototypes properly entitled to duty-free entry, as well as the permissible sale of such prototypes, following use in the United States, as scrap, waste, or for recycling.