Poll workers do not receive adequate training. Most are only brief for a few minutes the very morning of the election. This is part of the reason many counties at the very end then require individual votes to be recounted by hand by another poll worker. Many aren't even familiar with correct voting procedures.
If we are going to have technology like electronic poll machines for major elections, they need to have workers more qualified to handle them than those currently. Too many stories are released every year about poll workers losing votes and rendering machines useless due to incompetence, and there needs to be greater technological oversight for these machines.