AUSTIN, Texas – As investigators try to find the motive behind Sunday’s attack, officials are hoping to find answers from the gunman’s cell phone.

But so far, no luck and according to the FBI, this isn’t the first time officials have had trouble getting into cellphones for investigations.

FOX 7’s Mike Warren talks to former U.S. Attorney Johnny Sutton, who is now a partner at Ashcroft, Sutton Reyes, about the importance of authorities being able to access cell phones during investigations and how FBI need access to cell phones of assailants and terrorist. Video Interview with Johnny Sutton