Well, maybe.
From what I've read, the companies must contract with their own independent labs and affix a DOT label before importation and that by doing so, they have made the claim that they have the helmet has passed the DOT standard. I've never seen that they actually "approve" anything. This is one of the complaints about DOT which Snell is supposed to take care of, since DOT essentially relies on the honesty of the manufacturer.
But then again, I might just have read between one too many lines. Does anyone know different?
Dave