In examining Fulton County, Georgia, he begins with the implied premise (my conclusion) that the Fulton County election officials have corruptly engaged in some type of vote manipulation that resulted in a number of illegitimate votes for Joe Biden being included in their vote totals. Simply examining the election returns from precincts in Fulton County is not likely to reveal any obvious anomalies because all the precincts in the County are under the operational control of the same set of election officials.

What Dr. Lott did instead was to look at precinct-level voting data for those precincts on the county’s borders, and compare the data to contiguous precincts in the next county over. The borders between counties are just arbitrary lines on a map. Oftentimes they bisect one neighborhood, with streets on one side of the line in County “A” and streets on the other side of the line in County “B”. The fact that the neighborhood has portions that vote in two counties should not cause the voting patterns in those neighborhoods to vary.
Dr. Lott did a similar analysis in other Fulton County precincts that shared borders with precincts in other counties. All showed statistically worse performance in absentee ballot voting by Trump in the Fulton County precinct than in the precinct on the other side of the county line. The range of difference in these various comparisons was from 5.8% to 17.3%.

Dr. Lott also looked at Allegheny County in Pennsylvania, which is surrounded on all sides by counties that voted for Pres. Trump, while Allegheny County was won by Joe Biden 60-39%. Dr. Lott again focused on the precinct level voting patterns in precincts that shared county lines with precincts in the counties won by Pres. Trump.

He found a similar statistically significant reduction in Trump support between the precincts in Allegheny County and the neighboring precincts across four other county lines where the voters were in the same geographic neighborhood with matching demographics. The difference was only about 1/2 of what he found in Fulton County, but it was present in all the examined precincts.

As was the case in Georgia, the mail-in ballots were counted in a central location by a process that was controlled by the Democrat Party in a heavily one-party county. Their counting — of the same neighborhoods — turned out significantly worse for Pres. Trump than did the counting of votes from the same neighborhoods by officials in four bordering counties.