latimes.com/science/story/…
Everybody gets a piece of gum to chew, deposits it into receptacle, pcr run in Situ, FISH/etc.
Positive result -> Indiv screened.
This is really something every airport should have had on site for, like, ~~20 years.
And If everybody’s dna gets jumbled together, there is less risk of data being misused for lack of identifiability.