Because, he wasn't put on suicide watch until a day or two after getting there, and...he wasn't on suicide watch the first time he was being held. He hasn't spoken to LE, and it doesn't sound like he's spoken much to his lawyer, but IMO, KR could just be saying that to avoid a thousand questions. I don't think LE did it as a precaution, there's obviously a reason for it. Even if he didn't say something, doesn't mean LE didn't catch him trying to do something to himself. I don't think they put him on suicide watch from deductive reasoning...there was some logic behind it. JMO