California election officials have rejected an electronic voting machine by Diebold after tests revealed unacceptable levels of screen freezes and paper jams. Three counties already have purchased the TSX voting machine, which was found to have a failure rate of 10%. Secretary of State Bruce McPherson said that was too much of a risk and notified company officials in a letter sent Wednesday. In a mock election held last week to test the 96 touch-screen machines, McPherson noted in the letter that his staff encountered problems with paper jamming on the printer module." The state withdrew certification for some of Diebold's e-voting equipment in April 2004 after then-Secretary of State Kevin Shelley found those systems unreliable because they lacked a paper trail.