Yes/no, kinda, maybe, sorta..is. The study situation is hit-or-miss depending on exactly what you are looking for. There have not been a lot of high quality studies looking at mental health in US based non-police first responders who were not involved with 9/11 or Hurricane Katrina. There is more data available looking at non-US responders, police, and first responders involved with major events. We don’t have permission to release some of the data we have. There is other data that has only been published in Portuguese. Some of the studies have methodological flaws that devalue the data gathered. The situation is not pretty.