Perhaps, if the defendant is incapable of making decisions for their defense, for their legal guardian to take care of that? The parents weren't remotely present.
Not to mention part of what's messed up is that for several of the forced confessions, he's locked in a room for hours being told repeatedly to say the 'correct things'.
Sure, perhaps Avery could also convince him to help with murder and whatnot. But that's not on camera. The police and defense forced confessions are, and are pretty cut and dry there.
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