In the context of vote fraud, a registered voter who stays home or votes absentee can be ‘voted’ at a precinct station without their knowledge.
In such case a conspiracy to stuff the ballot box ensues and the tally sheets need to reflect the appearance of the voter at the voting station. So marks need to be made on the poll sheets.
One of the findings of the McDaniel election canvassing effort was that in many many counties there were many more ballots cast than there were registered votes. This indicates stuffing the ballot box. So this presents the opportunity for the criminal fraudsters to go and alter the tally sheets.
The other argument that the criminal fraudsters will use in this context is that not everyone who shows at the voting station appears in the poll book of registered voters. In these cases the voter is given an affidavit form to fill out and is given a provisional ballot. These provisional ballots are to be held back until the status of the voter is sorted out. But those that stuff ballot boxes will dump fraudulent provisional ballots into the mix thereby losing traceability and diluting the votes of true voters.
But in any case the affidavits associated with provisional ballots should be subject to review and that along with questions centered around absentee ballots are at issue.