Probe Reveals Pakistan Bought U.S. Nuclear Technology Efforts by two U.S. agencies to gather more evidence have been stymied for more than a year by other American officials.By Josh MeyerTimes Staff Writer 7:27 PM PST, March 25, 2005 WASHINGTON — A federal criminal investigation has uncovered evidence that the government of Pakistan has made clandestine purchases of U.S. high-technology components for use in its nuclear weapons program in defiance of American law. Federal authorities also say the highly specialized equipment at one point passed through the hands of an arms dealer in Islamabad, Pakistan, named Humayun Khan, who they...