This is clever, if used correctly. I would help prove that someone was in a building, but would not necessarily help proving that someone was in the building on a particular day.
After a year of using an office, they still can't detect one guy but still detect the previous owner just fine
If you can only detect somebody after multiple months (up to multiple years for bad shedders) of residency, I'd imagine they would leave way easier clues than DNA in an AC unit
https://nij.ojp.gov/nij-hosted-online-training-courses/dna-p...
Geofenced warrents are already a thing. While they may not be constitutional, that hasn't stopped them from being issued and executed.
DNA from ACs could also be used to supplement other data to target specifc inhabitants with warrants.
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I'm not trying to say anything about the way things should be, but rather to correct you when you falsely reassure people that this won't and can't be used this way.
This is a general limitation of DNA collection/analysis I would think? If you find someone's DNA somewhere, it's evidence that they were maybe there at some point in the past, but not at a specific time.
For example: My DNA is probably on my coworkers clothing. Which means it is in their homes, even though I've never been there.
I wonder how many snakes one would find by average in an office.
Our DNA ends up in weird places. For example, someone’s DNA is probably on this plastic bag at the bottom of the ocean…
https://education.nationalgeographic.org/resource/plastic-ba...