proguess or gary kessler is a digital forensics expert. k, former special agent for the fbi that worked the world trade center investigations. gary, how much are investigations using cell phone images and calls. >> incredible number, particularly criminal investigations rely on cell phones and computers. digital devices certainly in the last 10 and 20 years have become increasingly either the target or the instrument and or the record keeper of criminal activity and other nefarious activities. so being able to look at what's on the digital devices becomes incredibly important. mobile phones in particular, i don't have one with me now, but mobile phones in particular as we more and more of us are using android devices and iphones and other smart phones, it is essentially a portable internet terminal, and so not only do i have traditional call history and contact list and text messages, e-mail, browser history, gps and other information and other information we thought of on a desktop or camera is now with us all the time. >> don, i want to a