a clinton spokesman said both the letter and spirit of the rules permitted state department officials to use non-government e-mail as long as appropriate records were preserved insisting they were. but there may be no way to verify it. david kennedy, a cyber security expert who used to work with the marine unit said personal e-mail isn't backed up the way a government account. >> when you delete that in your trash box and out of there, it's gone. no more recovering it. all that information is now completely destroyed. >> brianna is joining us now. have they explained the clinton camp why she used the private e-mail address? >> they said this wasn't anything nefarious. an aid told me she was using her blackberry before she was secretary of state and continued to use it after she became secretary of state but whether or not she broke a law and found no evidence she has, wolf she certainly violated the spirit of