I actually hope they were. Such a document would be unenforceable and clear proof of coercion.
I would sign it to get my kid back. Then I would mount a campaign to annoy the crap out of all the politicians who did not help me. I would sue. I would call for criminal charges against the doctors and state workers who carried out this hideous act. I would start a newspaper and buy ink by the barrel. I just wouldn't stop.