The resulting study concluded “virtually every important software security mechanism is vulnerable.”The paperless machines, however, stand out as particularly vulnerable. In fact, Dr. Halderman quips, he has a paperless e-voting machine in his office now. States rushed to adopt e-voting machines after the contentious 2000 presidential vote recount in Florida, but now they are backpedaling. In past years, poll workers were sometimes sent home with voting machines they were to set up the next day. Colorado, which still uses paperless e-voting machines in Jefferson County, is among the states stepping up its protocols to make sure all its machines remain secure.