A Missouri high school announced it would ban smartphones and smartwatches beginning Monday. Steelville High School made the announcement Thursday on Facebook, claiming it's the school's latest attempt to prevent students from taking photos and videos of each other for social media. The new policy is a roundabout way to prevent child pornography from being filmed in the form of impromptu videos in school bathrooms, according to the principal. ... Student devices will be locked up and returned upon dismissal or they may choose to not bring them at all," Principal Steven Vetter wrote. "Any student who violates this new...