My mom is white and her test came back like 115% white with a 2% margin of error. No joke, all her people came from Britain with some Scandinavian DNA likely from before the Battle of Hastings. There is a small chance she has some German, French, and Estonian.
So then there's me and it always cracks me up when racists want to compare DNA. Since "one-drop" is a fuck, that would likely backfire on them. Of course I'd still get deported and they'd get to stay because it's all vibes based and DNA tests are nonsense.