Democrats seem very concerned that the USPS, DHS, FBI and NSA could use new tech on postal sorting machines to detect cloned or forged ballot stuffing by mail.

All clues are the Feds almost certainly can.

Congresswoman blocked from touring mail facility by Postal Service police

https://www.nbcnews.com/politics/congress/congresswoman-blocked-touring-mail-facility-postal-service-police-n1239359

House Democrats call for immediate suspension of Postmaster General Louis DeJoy and launch investigation into his testimony to lawmakers

https://www.dailymail.co.uk/news/article-8708259/House-Democrats-launch-probe-Postmaster-General-Louis-DeJoy-Washington-Post.html

Federal IT Leaders at DHS, NSA Highlight Election Security Efforts

https://fedtechmagazine.com/article/2020/08/federal-it-leaders-dhs-nsa-highlight-election-security-efforts

Lawmakers ask Trump’s postmaster to return sorting machines

https://www.federaltimes.com/federal-oversight/congress/2020/09/01/lawmakers-ask-trumps-postmaster-to-return-sorting-machines/