Please see last line in a conservation in Designated Survivor S01E09 (emphasis mine):
Foerstel: It's nice to see you, Agent Wells. It's been a while.
Hannah: Well, John, in your line of work, that's generally considered a good thing.
Foerstel: Look, I know that you were close with Jason Atwood, but it's a friendship that could cause problems for you.
Hannah: Why? - Am I under investigation, too? - Come on.
Foerstel: You're smart enough to know that you're wrapped up in this. You were with Jason at the prison when Nassar was murdered. You were there with him during the interrogation.
Hannah: What is the point of this? You of all people know that Jason's not a murderer.
Foerstel: Well, I can't exactly ignore a confession. [Sighs] If this was so cut-and-dry, why are you doing an investigation at all? All right, I'll bite. If Jason Atwood didn't kill Majid Nassar, who did? You're not doing yourself any favors, Hannah. And I know you'd rather answer my questions than a federal prosecutor's.
Hannah: Wow. We used to be on the same side.
Foerstel: Yeah. And we still would be if you and Jason had ever learned how to play by the rules like I warned you to years ago. Instead, here we are. Oh, and, Hannah, I'm paying Jason a visit this afternoon. Your stories better match.
So what's Hannah's story? Was it told off screen?
I'm guessing it's that Atwood DIDN'T kill Nassar while Atwood's story is that he killed Nassar? I don't understand what's happening. Of course their stories wouldn't match. They wouldn't even be close. Atwood probably had a bunch of details made up for him mean while Hannah's story is simply I guess 'We didn't torture him'?