The University has set expectations on the part of staff in developing and promoting academic integrity and penalising academic misconduct. This page includes information for staff members, if you are a student you should refer to Academic honesty & plagiarism.
If you identify something that may constitute a breach of academic integrity, the suspected case should be passed to the relevant course convener. Even if a student withdraws from a course, a potential breach of academic integrity in that course will still need to be investigated to its conclusion.