I observed the Kitsap County recount.
It could be our optical scanners are poor. Or...
I happened to watch a table of two older gentlemen, late 60's and 70's. In addition to the Republican one setting a Rossi vote into the overcount pile, the two men had many problems counting the ballots and batching them in groups of 25 as they were supposed to do. (I got the Rossi vote out of the overvote pile after talking with our county auditor)
Each party rep is supposed to count the other party's ballots first and batch them into groups of 25. Well the Republican party rep kept under batching the Gregoire votes creating a superficially increased count for her. The Democrat consistently overbatched the Rossi votes creating a superficially decreased count for Rossi. Now whenever the numbers they report don't match the machine count, the table's election official has to come back to the table and tell the two they need to count again. So the two switch and count their own party's ballots. This is where I observed the numbers changing and realized the batching problem. Towards the end of the day, the Dem had one precinct that he mistakenly hid 8 votes for Rossi. Now I don't think there was fraud intent there, just human error in a repetitive task hard for older hands to do.
But I certainly see now where there's room for human error.
Thanks for the information.