Students at the University of Central Florida (UCF) were caught cheating on midterms by business professor Richard Quinn.
According to ABC News, Quinn was alarmed after reviewing test scores to find they were higher than they were before and did more statistics before an anonymous student confirmed his suspicions.
Quinn addressed his class through a videotaped lecture and explained the test scores were higher.
About one-third of his class, 200 students, are thought to have had copies of the test before they went into class to take it.
ABC News also reported this cheating scandal is the greatest in UCF history.
Quinn told his students if the were to confess to cheating, they would be forgiven upon taking a four hour ethics class.
He told ABC News only about half of the students who cheated have confessed.
All 600 students, despite whether they cheated or not, must retake the midterm.
Students were given a deadline of Wednesday at midnight to confess or face the risk of being expelled.
To read more about the UCF cheating scandal, visit abcnews.go.com.