As a Federal Aviation Safety Investigator I am involved in the investigation of several cases of crew members who became seriously injured after experiencing a so-called fume event. Since I am obligated to take into account all facts available for my analysis, I had to watch the documentary "Unfiltered Breathed In: The Truth About Aerotoxic Syndrome" by Mr. van Beveren as well. To my surprise some of the victims I have met during my investigation were introduced in the film with their personal health issue. I also have had a chance to talk to Prof. Abou-Donia and Prof. Heutelbeck myself about the physiological implications after inhaling toxic substances. The facts referring to persons presented in the film whom I am familiar with are in accordance with the information I obtained. Furthermore, the fact that there are toxic substances in specific fluids used for aircraft (e.g. hydraulic fluid, engine oil), and that there is a possible way by design for them to enter the cabin via the bleed air system is without doubt. Therefore, I do not impeach the general validity of the presented facts in the documentary film, although I rather would have preferred the opposite conclusion.