Use of ChatGPT/AI while in rounds

My kid just lost to another kid in varsity Lincoln-Douglas who was 100% using AI generated rebuttals. There was an audience (final round) and those who observed agreed that's exactly what happened. The judges were inexperienced parent judges and I guess they didn't pick up on it. That kid couldn't even answer a question properly during cross-examination yet somehow had a flawless articulate rebuttal with high level vocabulary. I think they must have been recording my child's speech and then feeding it into an LLM. Before the debate, they even asked that no one sit behind them. How is this allowed? How is there nothing in place to prevent this? I'm pissed on behalf of my hard working kid! At this point I think debate should go back to pen and paper.