That's all well and good for legal immigrants... assuming you can swab babies or something, and can test in minutes instead of days.

What about the hundreds of thousands or millions [0] of illegal border crossings every year at the mexican border though?

[0] Naturally good stats for this are impossible to find, but in FY19 851,508 individuals were apprehended at the american southwest border [1]. It seems reasonable to assume the same order of magnitude of people successfully crossed.

[1] https://www.cbp.gov/newsroom/stats/sw-border-migration

There might not be any foreigners let in at all for a while. I was talking about citizens. Prepare for fundamental erosion of our rights - that one is almost guaranteed now. I won’t be surprised if they go to apple/google and telcos for location data to aggressively backtrack infected. It’s either that or millions of deaths. A perfect zugzwang

The Tweet is now deleted, so probably just a rumour, but Sky News tweeted earlier:

> Sky News understands the [UK] Government has asked mobile network O2 to hand over anonymous mobile phone location data in order to ensure people are following social distancing guidelines during the COVID-19 outbreak

I suspect it's at least being discussed.

My impression is that without (currently illegal) immigrants you won't have enough farm workers. How do you avoid a famine?

(I'm also skeptical that stopping illegal immigrants will be as simple as tracking phones, but whatever)

Japan is doing that with free Sims for people arriving

Oh. That's easy Trump will build a wall with CDC budget. ;-)