Can't speak for other places, but every time I've voted in-person in Wisconsin it has been through a procedure that doesn't involve the poll workers seeing my b

Can't speak for other places, but every time I've voted in-person in Wisconsin it has been through a procedure that doesn't involve the poll workers seeing my ballot after they give it to me. After getting a folder containing a ballot, I take it over to a closed stall to mark it and feed it directly into the scanning machine when I'm done. Safe, secure and results in immediately knowing that your ballot is valid and accepted. As a sibling comment mentions, states and cities have a great deal of freedom in terms of the "how" of voting and some do it better than others.