I asked a few people with experience in other districts and they said altering the original ballot was strictly forbidden. If they needed to make a correction, then they would re-make the ballot by transferring the vote from one ballot to another with more than one person providing oversight, and they would preserve the original ballot. But in this election, the ROV said that because they ran out of "crossover" ballots, they had to use Democratic ballots for NPP voters who wished to vote in the Democratic primary for president. Those NPP voters are not allowed to vote for the Central Committee members, which is also on the Democratic ballot (but not on the crossover ballot). So if an NPP voter requested a Democratic crossover ballot AND they were out of those ballots AND they gave the voter a pure Democratic ballot AND if the NPP voter attempted to vote in the Central Committee race, THEN they would need to white-out the Central Committee race.
Although non-standard, that explanation seems reasonable. However, it does NOT explain any situation when workers should white-out votes in the presidential race. It also does NOT explain why workers use white-out on VBM ballots, which can be observed in item #5 below.
1. Written observations by Patricia Gracian, attached, regarding white-outs.
Patricia and Josephine explain that many ballots were thrown out due to address mismatch. However, election law says address will not be compared at all for provisional ballots. https://www.youtube.com/watch?v=6RmjGcxUKHM
4. Charlie Wallace confirms whiting out of ballots is being done.