regret for a massacre that left 20 people dead. we've also learned that the justice department is seriously considering bringing federal hate crime and federal firearm charges against the suspect. josh campbell has been following the story. he is a former fbi supervisory special agent as well as a cnn law enforcement analyst. tell us what value investigators can learn from a shooter can who in unusual circumstances rather than dying in the midst of a massacre like this, turned himself in. what can they learn of value now? >> jim, we've seen so many instances in the past where a shooter will be engaged by law enforcement and is killed or opts to turn the gun on themselves. we saw that a week ago in california at the food festival are a footer killed three people, injured a dozen more and then turned the gun on himself after being shot by officers. this is a different case in el paso because the shooter is alive. he was questioned by law