So there was watermarks!
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If you put some non-radioactive isotopes in there, you'd even be able to detect them after burning. That would be expensive though
actually pretty cheap. that stuff can be sprayed down, think maybe a fire sprinkler system engineered to where the room was holding all ballots or even a gas cannister would be able to fill a room
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.