[kweinber]

This is an economics problem and this teacher should work with their Econ department to change the rules for course auditing and increase reputational costs to disincentive this behavior. A few options: 1) Make auditing those classes more expensive by limiting the total number of courses a student can audit, or capping the number of students that can audit those courses. 2) Make auditing a remote-only class option. 3) Give lectures on how to spot this behavior which will make the perpetrators obvious and undesirable. 4)Have a no-dating policy between students within the same class under penalty of failure. 5) Couple course participation with a mandatory internship at a STEM company (something a serious student would want but a time-suck for a fake student).

The economics department might enjoy testing these policy changes and could get some papers out of them.

(I wish I could have posted on the original site but I need some sort of karma to do that)

[whacim]

It is difficult to suggest solutions without knowing exactly what the course is, but designing a class project to develop a solution for an analogous problem might be a solution.

Assign the students a project to filter out students with ulterior motives from a theoretical class. The engineers will then be forced to produce a solution for the problem of their own creation while subtly alerting other students that not everyone enrolled in the course is there for the same reason.

[type-r]

This is a fantastic suggestion. Probably not going to be applied by this professor but I love the symmetry of 'playing games' back and forth. Sounds fun honestly, as either side.