In theory this is why unanimous verdicts are required. I was on a jury once for a murder case and we had the opposite problem. One juror kept repeatedly argui

In theory this is why unanimous verdicts are required. I was on a jury once for a murder case and we had the opposite problem. One juror kept repeatedly arguing that she thought the guy was guilty of one of the charges, but she couldn't explain why. Everyone else voted not guilty, because the evidence just wasn't there. We had to repeatedly explain to her that she was the textbook example of reasonable doubt. Eventually she decided to vote not guilty but it cost us several hours because it had to be unanimous in either direction.