Personally I believe him but I also believe that the powerpoint is far from enough. It contains nearly no information about what's Prism except that it exist an

Personally I believe him but I also believe that the powerpoint is far from enough. It contains nearly no information about what's Prism except that it exist and keep information from different companies. A good evidence would be an actual use of the system. If I remember correctly, he said in an interview that he could go as far as getting informations about Obama. That is the best evidence you could show.