He should use every advantage he gets to! I would say 99.99% of the people, if they were in your friend's shoes, would try their best to get their URM status. It's part of the education process. You can't blame the individual but only the system if it really pisses people off.
your friend is clever. as future lawyers, finding loopholes and reading the fine print is everything, and if he believes he fits the "qualifications" to be a Native American, then by all means, he should use it to his advantage.that being sad. i can assure you that when he takes the bar exam, they will see that he identified his race as Native American. they will look at all applications, do a complete background check on your friend to ensure there are not discrepancies and flaws in his integrity. though i do not know what they will think about being 1/67th Native American, i can tell you that they have prevented people from taking the bar because of misrepresenting ethnicity on applications.