Fruits which have been treated with 1-MCP do not trigger any labelling regulations, and are allowed for use with certified organic foods, and are therefore non-distinguishable from non-treated products.[3] In the United States the National Organic Program does not allow the use of 1-MCP on organic produce, however the only test devised by the United States Environmental Protection Agency; radioisolated analytical method is too expensive, though it can measure residues on fruit up to 90 days post treatment.[citation needed] Its convenience of application makes it easily accessible for farmers and producers. Studies have shown there is no residue left on the fruit post processing. Identified as a synthetic, 1-MCP is not approved for use on U.S. foods labeled “organic” by the United States Department of Agriculture.