Again, we may ask, what exactly is the problem? And is it getting worse?
What can we do to prevent cheating?
We will actively deter cheating only when whistleblowers are certain that they will be protected. The atmosphere must be warm. What makes an atmosphere warm on a given subject can be as simple a matter as regularly discussing it. Regularly discussing it, in many forums, by many people. Not only with the new students for a couple of hours on Orientation Day, although that is a good start, but repeatedly with the veteran students, and the faculty as well. And the upper administrators as well. Only in that kind of climate will those who observe suspected misconduct feel safe enough to bring it forward.