If you can submit the text to determine whether it's watermarked, you just have to progressively alter the content more and more until it passes.
the government can ask .... who? If the claimed text is genuine, then the government is responsible for submitting the text to ...? all frontier labs? surely not every model within a lab is going to watermark in the same fashion?
I'm so very confused on this implementation and would want to see an expected use case.