With regard to full-face and modular helmets primarily ask your local fire department/first responders if they would like to have it for training purposes. If they do drill a couple of good sized holes in it so that it is obvious that it is no longer to be used. They can use it to learn and train with on how to properly remove a helmet from a crash victim. Ideally they should leave the helmet on and let the doctors at the hospital remove it where it is more safe to do so. In some cases they have no choice however and need to remove it at the scene to render life saving assistance. If a full-face helmet fits properly it is not easy to remove if you simply grab it and yank. From what I have read, and from personal experience when I had a crash, they have no training on how to safely remove a helmet from an injured person. If they are not bikers themselves they have no idea how to remove it at all.