If the federal government was to establish a pilot program designed to covertly collect the DNA of every person living in, say, Denver. In a way where the DN

If the federal government was to establish a pilot program designed to covertly collect the DNA of every person living in, say, Denver. In a way where the DNA was matched to a person with a high degree of confidence. and the feds were willing to spend some serious resource on it. Wow long do people think it would take? Would it be possible? Big conferences must be an awesome opportunity. When people go to sign in and show id to pick up their badges and then wear the badges but that goes for a lot of companies too that have people wear various forms of cards / badges. Physical access to homes, work, gyms, public transit, hospitals, nursing homes, and cars would make it fairly straight forward for the majority of citizens. I dont think you could scale that to a city and do it quickly. Send out snail mail with some motivation for people to send back a physical reply? Send out snail mail ads and collect from the garbage / recycling? Keyboards would be awesome but harder to get to without physical access. Public transit is good. Airports. A crime spree could be arranged that gave law enforcement a good reason to stop and id people driving or walking around would be effective. Vaccines would be great but hard to establish in a specific regional area. A Qtip (or whatever)swipe of the screen of a cellphone? Free in person give aways that required a signature? If you just follow a person for a while walking in the city is there an easy covert way to get a sample? (Yanking out a hair is going to raise questions. ) Some form of "specialized" mini "vacum cleaner" to "suck" in cells from a bit of a distance. Probably hard to be accurate. Could probably do mass harvesting of DNA at gyms with a certain expectations of inaccuracy that would be improved with multiple runs or DNA from sets of people in different mixes.