IN 1927, a schoolteacher in Secaucus, N.J., named Helen Clark lost her teaching license. The reason? Somebody had seen her smoking cigarettes after school hours. In communities across the United States, that was a ground for dismissal. So was card-playing, dancing and failure to attend church. Even after Prohibition ended, teachers could be dismissed for drinking or frequenting a place where liquor was served. Today, teachers can be suspended, and even fired, for what they tweet or post on Facebook. Read the entire story on the NYT web site.