You ought to ask a local attorney for advice on that. Chances are that disclosing the contents of that interview will not violate any state law (I'm not seeing anything that would make it illegal in a quick search, but my search was not as thorough as it would be if I were researching for client) but it even if not illegal it might violate some department policy and that might have some impact on you if that is the case. Unless the court actually sealed the confession or issued a gag order in the case that is still in effect (both of which would be unusual) the disclosure would not be prohibited merely because the court held the confession inadmissible.