Want to have some fun- and are not afraid? If you see two male military age chinese in the same govt issued cloths walking around with backpacks taking pictures— go up to them and ask them for their entrance visas. Do it in a forceful manner— and see what they say. Couple of times— they RAN from being questioned. Pretty good clue-they spoke English fairly well.
This is a thing— happening because of Mayorkas and Xiden. Americans are not stupid.
Ok, I’ve already done similar with Latinos. Ask them if they are legal or not, you can tell immediately. I didn’t see it as fun, though, kinda pissed me off when most of them shied away (day laborers).