Helmet Rules

Hey, we all know very well that once a helmet is hit once, there's no guarantee it'll stand up a second or further time, right?
Does anyone know of anywhere that this information is documented, like in a standard or official document of some kind that I can use as back up in an argument over an insurance claim??
Any help better than "I heard" would be greatly appreciated.
Thanks
Does anyone know of anywhere that this information is documented, like in a standard or official document of some kind that I can use as back up in an argument over an insurance claim??
Any help better than "I heard" would be greatly appreciated.
Thanks
