[Jedidah]

In some states, voters don’t register by party. They just register, and they can choose party affiliation on the day of the election.

The voter roll lists all registered voters, not by party.

[don-o]

In some states, voters don’t register by party. They just register, and they can choose party affiliation on the day of the election.

Right. And the choice that is made that day is recorded and is to be preserved. That is how the Beat Lamar campaign has identified who has voted in previous Rep primaries.

[House Atreides]

“...The voter roll lists all registered voters, not by party.”
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True, but (I’m doing an educated guess here) there were likely TWO versions of those lists in each precinct. Registered voters in the June 3rd PRIMARY who asked for a Democrat ballot were marked in the Democrat header version of the roll and those given Republican ballots were marked in the Republican header version. The Democrat header and the Republican header books each had the identical list of registered voters in that precinct

That way you could see which ballot (Democrat or Republican) version each voter was issued int the primary.