> The first thing the records should have shown was the full messaging history which would not have contained any of the incriminating messages.
I think the point is that the message history would show incriminating messages.
He'd have been saying "this isn't me", but somehow no one noticed it was the wrong username.
You are right, but your parent is right too.
If the police logged into his Kik account from his device, they would have seen the lack of connection to the case. If they simply trusted the Kik account contents from the subpoena response, then it was up to the defendant/experts to identify the issue and rebut the evidence.