In determining the scope of a statute, a court must look first to its language. If the statutory language is unambiguous, in the absence of 'a clearly expressed legislative intent to the contrary, that language must ordinarily be regarded as conclusive.' Consumer Product Safety Comm'n v. GTE Sylvania, Inc., 447 U.S. 102, 108 (1980).
Of course, there is no errorless test for identifying or recognizing 'plain' or 'unambiguous' language. Also, authoritative administrative constructions should be given the deference to which they are entitled, absurd results are to be avoided and internal inconsistencies in the statute must be dealt with. Trans Alaska Pipeline Rate Cases, 436 U.S. 631, 643 (1978); Commissioner v. Brown, 380 U.S. 563, 571 (1965).