The defense should have responded with what I used to, which would inevitably get the judge too upset to speak for a short period of time:
"Objection, your 'honor'. Court may not insert personal opinion in lieu of the facts in this matter."
Be prepared to be threatened with "Contempt", however.
To be fair, the government is guilty of withholding evidence here. They are not revealing their methodology which is criminal. Is it even legal to use illegal means to do something?