Its official. In his first use of the veto, the president has refused to sign H.R. 810, or ғthe Stem Cell Research Enhancement Act of 2005. According to Bush, ԓHuman beings are not a raw material to be exploited or a commodity to be bought or sold. The bill, which passed the Senate just shy of the two-thirds majority needed to override a veto, would undo funding limits imposed by the administration in 2001.