An agency's interpretation of the law will not be upheld by a court unless it is supported by specific evidence-a reasonable explanation is not enough.

Courts often defer to an agency's interpretation of the law it administers if the interpretation is reasonable, even if there is no specific evidence supporting the interpretation. This principle is part of the Chevron deference, a doctrine based on the 1984 Supreme Court case Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc.