His method caught 14 out of 99 students red handed.
An engineering teacher who is 'on the older side' left his pupils astounded with his brilliantly devised method to catch cheaters.
Taking to reddit, a pupil in the engineering class explained that when they all sat down to take their final exam, about half the class left the room to use the bathroom during the test - far more than the usual.
After leaving the exam hall, the pupil remembered there was one particular question that wasn't related to what they had all been taught in class, which had two parts.
They said part A was 'fairly easy' but they had no idea how to do part B, so they simply left it blank as it only accounted for 5 marks out of 100.
Then once the exams had been marked, the teacher completed his trap to reveal how he had caught the cheaters out.
"Honey pot the cheating site. Genius!"
A lot of students use a website called Chegg, which provides answers to exam and homework questions, so the teacher decided to use this method against them.
The student wrote on Reddit: "He purposely made part B impossible to solve, and about a month before the final he got a teaching assistant with a Chegg account to ask the exact question, which was distinctly worded to be unique.
"He then created his own Chegg account and answered the question with a bulls*** solution that seems right at first glance but is actually fundamentally flawed and very unlikely that someone would make the same assumptions and mistakes independently."
From the 99 exams handed in, 14 of them fell for the trick and gave the exact answer their own teacher had posted online - and received a score of zero as a result.
Fellow reddit users were impressed with cunning plan, with one replying: "This is Amazing! I've seen some stories like this and it always makes me glad I don't use Chegg for tests.
"Honestly if you're cheating on a proctored test you deserve to get caught. Study like everyone else."
A second wrote: "Honey pot the cheating site. Genius!"
