What will the Wendy Carillo campaign do with the ballots they collect? They could open them even if they’re sealed to see who the person voted for and discard the ballot. I'm guessing they're not allowed to do that but if you’re going to go to the trouble to get the ballots into your office are you going to really care about that? You don’t even need to open the ballots. You can go into neighborhoods where your opponent is likely strong and “forget” to turn in the ballots. Sometimes things get lost.The person who cast their ballot has no idea if the ballot made it to the polling place, so who's to say that any ballots were collected that weren't turned in?
People have worried about voter intimidation from employers or unions. With this law these organizations are encouraged to ask their employees or members to give them their ballots. There's nothing stopping anyone collecting ballots from changing an election.