I am really curious how those Yale guys check applicants race. Some kind of skin color pigment measurement (sorry, you are a bit too white to qualify as African

I am really curious how those Yale guys check applicants race. Some kind of skin color pigment measurement (sorry, you are a bit too white to qualify as African American, next person please)? Or do they measure someones eye shape to "detect" Asian people? How about Jews, is nose measurement sufficient (they need to dig really hard in their archives to find some Nazi "scientific" statistics on that...) or they just ask to take off pants during interview to check if someone is not hiding his race?