When David M. Hall set a rule in his Lake County courtroom, it applied to everyone. Even him. “He had a pretty strict rule, stricter than many, about cellphones going off in the courtroom,” said Lake County Circuit Judge Margaret J. Mullen. The punishment for a phone ringing in Hall’s courtroom, Mullen said, was confiscation by a deputy sheriff. That’s exactly what happened to Hall once during a court call when his own phone rang. He pulled it out of his pocket, looked at the deputy sheriff …