Hmmmmm.
Y'know, that's a good question. I know a lot of rule books and track day regulations say, "DOT approved helmets", and they do inspect your helmet during tech. However, in my experience, they are looking at the overall condition of the helmet. I don't remember actually seeing a tech inspector checking out certification tags.
I suppose it's possible they could hassle you on that rule, but damn, they would really have to be a bunch of d*cks to do that.
If you know the track day organizers or race clubs you might want to run in your area, maybe you should call them and ask what their policy would be before you invest in the helmet...
It would definitely suck to get that sweet new lid, and then have them tell you you can't ride on a track with it!
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A fool and his money are soon partying.