Red China's Wuhan Cov19 App for Smart Phone
Soon to come to the Good old USA if My crystal ball is working right.
Restaurants and malls are open, but to enter, customers have to activate a health code on their smartphones. The code tracks their movements and determines whether they have been to any risky places. Only those with green codes are allowed in. Many offices insist on green codes, too. A red code, or even an amber one, is the scarlet letter of 2020.