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The DRT program encourages manufacturers to test technologies (e.g., nozzles, spray shields, drift reduction chemicals) for drift reduction potential. The agency hopes manufactures will label products for use with DRT technologies. Four DRT ratings (i.e., 1, 2, 3, 4) are given to technologies that have at least a 25% reduction in potential spray drift. Visit EPA's website to learn more about the program and how to participate.