Speaking to an official here earlier, they said very much north korea and rogue state actors are on their mind. s in yes, this is about north korea, but it's not a direct response to the three missile tests. >> they get to work and we are at 50% success rate. what's the thing that gets us to 100? is it technology or human skill? >> more test, right? to get to that level of certainty, these guys are scientists. they are looking to corroborate and falsify. when you talk to the scientists behind this, they are interested in the technology of it. to get to 100%, mathematically that is impossible. ...