It's possible that it might be easier to tamper with these than other ballots, but there must already be countermeasures in place to deal with these types of is

It's possible that it might be easier to tamper with these than other ballots, but there must already be countermeasures in place to deal with these types of issues in a large scale election. In Australia, each candidate is able to send a scrutineer to each voting and counting location, and it's not exactly done in privacy where tampering would go undetected: https://www.youtube.com/watch?v=XevjASEgoK8 https://www.youtube.com/watch?v=XevjASEgoK8