The arguments need to be based on actual law, and any cited reference cases need to be real.

There's been a lot of news stories about lawyers using AI, and then getting in trouble for citing hallucinated laws or cases. It doesn't matter if the AI response is "preferred" over the human one if it gets thrown out when put under the scrutiny of a real case.

maybe seeing if the case law it cited was real or imagined? Just one idea, IANAL