When cobbling together the landmark No Child Left Behind Act in 2001, Congress quietly tacked on an unusual provision that says the law does not require states or school districts "to spend any funds or incur any costs not paid for under this act." Little noticed at the time and lifted directly from an earlier version of the law enacted in 1994, the clause was originally pushed by Republican legislators wary of federal intrusion into schools by the Democratic administration of President Bill Clinton. In a historical twist, the language has now become the main legal weapon brandished by those hoping to prove in the courts that the Republican administration of President Bush has overstepped its authority in carrying out the law he championed. The legal action against the Bush administration's implementation of the No Child Left Behind Act comes as complaints about the costs of complying with the 3-year-old law are mounting. Congress said this is not an unfunded mandate, but that word does not seem to have gotten through to the Department of Education.