<img src="https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/W746O267VVICO7H6XFFKM3K7K4.jpg&w=1024" /><br>Five high school students helped our tech columnist test a ChatGPT-writing detector coming to 2.1 million teachers from Turnitin. It missed enough to get someone in trouble.