I don't know if anyone has stated it publicly but I would assume that a recorded conversation between a suspect and a reporter would always be considered evidence since both parties can testify in court. There could be some push-back if the conversation was considered confidential/private but I don't think that was the case here.
Prime8, (figured out your moniker, finally...,duh primate in the jungle. Ok, you are officially my Jane Goodall of posting.) Since thousands of people viewed at least part of the jail house interview, I agree with you... no way was it confidential.
But, if we could link it, some interesting "lies" appear.
1) BMcD asked if he had ever spoken to KG.
He denies it. Yet KG specifically spoke with A_S for 5 minutes, on the night of Feb. 13 2017 while at the police station asking if he had seen/heard from/or knew where the girls were.
2) BMcD also asked if he had been to Delphi.
He also denies that, too. I've never been there...then backs off to say he was there "for a football game." HE WAS IN DELPHI
3) BMcD asks about him being the last person to talk to Libby. Again KK produces another non- answer. "That's what they tell me."
Those are just a few of the 'KAK-two-step" answers. Amazingly this guy has figured out how to lie about his lies! "I don't recall" "That's what they say." "I don't remember", "I talk to lots of people." (If he spoke to so many people KAK, when did he have time to be lonely? Sounds to me as if you had quite an active social life. You had grandparents, siblings, dog, Mom, Dad, step-parent, pals you "drugged with" , drug delivery business....)
A) When does KAK lie? He lies the moment he rolls out of bed.
B) Why does KAK lie? Because he is breathing.
C) How to spot a KAK lie? See A and B
BTW..I'm not getting good vibes on the river search right now. Something is off. Ugh. Is he manipulationg LE & prosecutors? "Hey, I told you where to find the weapon. Not my fault you guys can't find it....I demand a reduced sentence for cooperating."