Six University of Maryland business students have been caught using cell phones to cheat on an accounting exam. Six others are implicated in the case. Knowing the professor would post the answer key while the test was in session, the students arranged for accomplices not in the class to send them the answers via text message during the exam. Knowing what the students were up to, UM professors staged a sting operation: they posted a fake answer key with incorrect answers in order to out the cheaters.