Quote:
Originally Posted by Sieg
Another factor I see discounted too frequently is helmet age. Over five years old is compromising safety IMO. If a helmet has experienced a decent impact the shell may appear fine but the critical issue is compression of the styrene inner liner which can be difficult to detect. 
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I agree
If any helmet is dropped or impacted it should never be used again!!!!
NHRA will inspect your helmet right after a crash (as they do your car) and if they see any marks they think are unsafe, they pull the snell sticker out of your helmet and it will never pass tech ever again..it's only up to you how safe you want to be.