So there was watermarks!
(twitter.com)
You're viewing a single comment thread. View all comments, or full comment thread.
Comments (284)
sorted by:
depending on the isotope they use they can pretty much have a different marker on each batch, which can be traced location to location via satelite.
I think you would need a mass spectrometer to detect the non-radioactive isotopes in a ballot. It would be a forensics thing.