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All I can say is that deer better have a completely light brown tail with no black tip on it and better be white on the underside or he will have a big problem with the warden if checked.
what general region? can you share a pic?
I think you have to err on the side of safety. You could call enforcement and ask them what they think, and then take down names and phone numbers lo back up your claim if they suggest it is OK to harvest that deer. I doubt they will. Hybridization cannot be proved without genetic tests, so without obvious signs that it is strongly Whitetail, I'd say you're in a precarious position killing that deer.