“The question is whether a tariff classification ruling by the United States Customs Service deserves judicial deference. The Federal Circuit rejected Customs’s invocation of Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc., 467 U.S. 837 (1984), in support of such a ruling, to which it gave no deference.”
“We agree that a tariff classification has no claim to judicial deference under Chevron, there being no indication that Congress intended such a ruling to carry the force of law, but we hold that under Skidmore v. Swift & Co., 323 U.S. 134 (1944), the ruling is eligible to claim respect according to its persuasiveness.”