I've discovered 2 interesting things relating to the ballots:

There is a patent for a technology called "gamma printing" which uses gamma radiation emitting particles to watermark documents, and is otherwise undetectable without specialized equipment. This lends validity to the theory of using "isotopes" to mark ballots: https://www.osti.gov/doepatents/biblio/1174865

In the process of researching this, I came across something very interesting:

One of the largest printers of ballots, and provider of election-related services is Runbeck Election Services in AZ: https://runbeck.net/about/our-company/

A little background: https://www.npr.org/2020/05/03/848347895/ballot-printers-increase-capacity-to-prepare-for-mail-voting-surge

So I dug a little. Brian Runbeck, an immediate relation to the CEO of RES, as well as immediate family, are also political donors to ActBlue and Biden For President: https://www.fec.gov/data/receipts/individual-contributions/?contributor_name=runbeck&two_year_transaction_period=2020&min_date=01%2F01%2F2019&max_date=12%2F31%2F2020

Does anyone see a problem with an immediate relation to the the ownership of what is one, if not the largest distributor of ballots in the US, donating to the Democrats?

If anyone has some free time today, more digging is warranted. I've got meetings and will do my best to fill this out more.