Some say that postal voting in the USA is a potential problem in getting an accurate result in the November 2020 Presidential Election.
This includes the current President, Donald Trump.
It was also an issue in previous elections.
A quick lookup found this in 2012.
The above 2012 article says: “The flaws of absentee voting raise questions about the most elementary promises of democracy”, when discussing the comments from Justice Paul H. Anderson of the Minnesota Supreme Court.
91.1 - 777,523