I would think a detection device would be easy to fool or disable, and difficult to prove in court.I would focus on inspections and look for the following evidence, then document with pictures, written warnings, demands of cleaning/repairs, and follow-up inspections.

By my standard I suppose we can put a bold lettered warning at the top.

Did they give any warning and did people go on to create other Alumni pages of their own?

Additionally, these investors can provide warnings about potential red flags, ensuring you hire reliable contractors and property managers.

Your warnings and advice will be shared with my partners. 

YOU HAVE BEEN WARNED! 

So, you should really reread their advice several times, then do your own research to fully understand their advice:)Don't let our responses dissuade you & your friend from investing, rather use their warnings to adjust your course of actions.You can probably find many examples of Partnership Agreements online.

Whether I talk to them or not, I document with a written warning and give them X days to clean up and pass another inspection.

On Student rental side of things I would STRONGLY warn you against that UNLESS you can show you really know your stuff in this specific St Cloud market for specifically student rentals.

Experts are divided, but what do you think—are there warning signs suggesting caution for potential buyers and investors?