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>> the biggest blessing is we have incredibly dedicated men and women who do this kind of stuff. phil, this ain't easy what they just did down there. this guy wasn't leaving any good indication where they were coming from. we know there was an army down there, termed used by the mayor in thanking them. how hard was it for law he enforcement to figure out who this was and relatively quickly if you think about it? >> it depends whether he made mistakes. when you have this volume of activity and you have this kind of digital trail, which i want to get into, the guy is going to make mistakes. he i...

Good. $320 a month paid direct through papal and google wallet to teach just four classes, and black fist would promote it. what was also weird, no one from black fist ever showed up to meet him. his only communication was in text and far away sounding phone calls from this man named taylor. >> hello. this is taylor. >> reporter: the digital trail suggested the context on the phone was part of a russia propaganda arm seeking to stroke racism. the accounts connected to black fist are among the pages facebook identified coming from russia. links to those accounts appear on the black fist website...

Of these hacking attacks and why it is important to know what russians were up to. >> thanks you. evan perez. phil mudd, you're an expert. what is your reaction when you hear this federal contractor, woman named reality lee winter, charged with quote removing classified material from a government facility and mailing it to a news outlet? >> i'm hearing it as you do. i will control myself. i hope they goes to jail. if she's guilty, i hope she goes to jail. we have a digital trail on terrorists we talk about repeatedly they leave an e-mail trail, travel trail, you see the same thing play out in ...

Attack on texas cartoon contest. one of the big questions will the twitter trial lead to anything other than the gunman and isis? jonathan hunt is live in texas. jonathan? >> greta, the digital trail leads in several directions right now. but investigators are looking at one in particular. twitter communications between elton simpson the ringleader of the attack here in garland and a man called muhammad hasan originally from minnesota now believed to be in somalia, fighting alongside isis affiliated groups. days before the attack here in texas,-month-old hasan using the twitter handle. referre...

Tools to work with. we take you inside the nypd's closely guarded crime lab, a frontline for capturing criminal. it shows detectives a clearer picture. so do evolving computer programs adding greater detail to tracing ballistic evidence. advances in dna analysis are widely considered the most meaningful step forward towards solving more crimes. but the forensics are just pieces of the increasingly elaborate puzzle. you really can't escape the cameras. they're virtually everywhere. windows that can capture potential crimes. and with evolving facial recognition technology they could be used to c...