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Some machine learning systems that recognize patterns work very well. But some are not reliable enough to be used in real life. A school's "gun detection system" that analyzes camera images saw a student's bag of potato chips and recognized it as a gun, whereupon thugs were sent to handcuff him and search him. A conscientious human could have

the Guardian
US student handcuffed after AI system apparently mistook bag of chips for gun
Baltimore county high schools have gun detection system that alerts police if it sees what it deems suspicious
Glossary