The difference in stripes to body color seem to be greater with hybrids/stripers. Real dark and real light. Whites have more subdued lines and a yellowish tint. Like sasquatch said, when in doubt, chunk um back. TPWD will check the tooth patch.
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"Stand clear and you won't get hurt"
A hybrid will have more broken stripes, real stripers will have solid stripes going down the sides. Striper's teeth are two ridges. Thats what i usually look for.