They look Indian in the face, don’t need to shave, have very dark skin, and have a grandparent or greatparent who is verified Indian. But their DNA comes out without showing any Indian DNA, or sometimes trace amounts. It’s clear that something is messed up with the standard DNA tests and American Indian heritage. With Britain or West European or Iberian Peninsula, it all seems to check out in line with known heritage. But with Indians, it is off.
If the “Native Americans” or Sibero-Americans, wisely refuse to let their DNA be taken it may be hard to develop a data base that allows the determinations.