CBS did not interview Staudt, the Killians OR Ms. Knox.
cBS did interview the Killians son and mother. They didn't say what cBS wanted so they burried them as witnesses.
Killian the younger said he gave cBS a whole list of people to talk to.
Oh, you're right; I remember now that they said they called them right before the show and that they told them that they sounded fake, that he didn't type, and that he didn't keep personal memos.