(CBS) A CBS News investigation last month found that nearly every digital copier built after 2002 stores an image of documents copied, scanned or emailed by the machine on hard drives. CBS News chief investigative correspondent Armen Keteyian reports parents and students at Dos Palos High School in Sacramento found out the hard way recently, when CBS affiliate KOVR pulled hundreds of student names, home addresses, cell phone and social security numbers off the hard drive of an old school copier. "The fact that information that we treat very, very carefully somehow got out of our system and is out...