Couple of points that I omitted.

First, I was teaching at a local community college. The students were from a nearby university. They were trying to avoid the equivalent classes at their own school and I assume they felt that I might be an "easy mark." I'm not sure what my options were with respect to reporting them to their own university.

Second, I was an adjunct at the community college. I informed the Dean of what was going on, but I got zero support. I could tell that the Dean felt that all I was doing was bringing him a problem that had the potential to mushroom into a political nightmare (no upside, only downside for him). The unspoken message that I got was, "Just deal with this on your own and don't turn it into a federal case." I don't know if the lack of support was due to me being an adjunct or whether it was due to "We need to keep our enrollment numbers up. Don't get a reputation for being a ball-buster."