A history professor from a university in the United States reported that he implemented an invisible prompt in an assignment to determine which students were using artificial intelligence for cheating. The result was significant: 32 out of 35 students were observed using AI.
AI Detection Method
The strategy of Jason Gibson, a lecturer at Alcorn State University, involved placing a command in white font within a PDF file sent to the students. This instruction was addressed to the AI and required it to include the word 'Madagascar' somewhere in the answer without any logical meaning.
After receiving the assignments, Gibson found phrases such as 'Madagascar flutua de lado pela tarde' and 'A bicicleta púrpura de Madagascar cochicha para o teto.' These examples indicated that students copied material, inserted it into AI, received a finished answer, and submitted it without checking the content.
The professor emphasized on his TikTok account that his goal was not to mock or humiliate the students; they even had the option to appeal their grades, although only two took advantage of this possibility. Gibson also stated that he is not against AI but believes there is a substantial difference between using a tool and having it complete the entire work.
The Impact of AI on Education
Since the public release of ChatGPT in November 2022, the lives of educators have undergone serious changes. Where previously they struggled with students who simply copied from the internet without reading, students now have access to a tool capable of generating texts almost instantly on various topics, not always with correct information.
Initial attempts to ban the use of ChatGPT and similar systems proved ineffective. According to TIC Kids Online Brazil 2025 data, about 65% of young Brazilians aged 9 to 17 use AI, and school assignments are one of the main targets of this usage.
Consequences and New Measures
The consequences of this phenomenon are gradually becoming apparent. A study by the Massachusetts Institute of Technology (MIT) indicates that the application of AI reduces the level of learning and critical thinking. In addition to Gibson's method, other instructors have begun taking measures to complicate AI use. Roberto Serrano, a professor at Brown University (USA), decided to conduct an in-person examination after suspecting excessively high scores in remote assessments. This step resulted in a 50% decrease in academic performance.



