What should I look at for such evidence? If something is highly regulated and controlled then things would be quite different from today, not sure there wouldn't be reports of failures of containment, for example, if they are mandated including any rquired monitoring.
There's a perfect example of "highly regulated and controlled industries" in which people no longer self-report: aviation.
Pilots do not (or no longer) self-report mental illness at the same frequency because it effectively destroys their lives and career. One paper of many describing this phenomenon: https://pmc.ncbi.nlm.nih.gov/articles/PMC11302551/
Airlines cannot try to put systems in place to deal with the issues? This isn't just about individuals but also organisations. You have to believe that organisations would also want to hide things even if mandated and incentivised otherwise.
Airlines sometimes try, but the regulations are federal, and the liability for the airlines of having a "pilot with reported mental health issues" is huge as well (because ultimately it's their business on the line if things go south).
So getting pilots to self report has been very unsuccessful because of how badly it ends for them.
A couple of days ago the senate had to pass a bill to make mental health medication access easier for pilots. We will see if it helps, but it doesn't solve the root cause (punitive measures) so I doubt it'll move the needle.
Not so sure about the dynamics when it is a group of people with individual and collective reporting obligations and knowledge isn't just with one individual.
