Should smartphones be banned in K-12 schools nationwide?

The problem is not just misuse, it is presence. A 2017 study in the Journal of the Association for Consumer Research found that the mere presence of a smartphone, even face down and silent, reduced people's available cognitive capacity on attention and memory tasks. The researchers called it 'brain drain': part of your mind is busy not thinking about the phone. That finding detonates every compromise based on discipline, because it means the kid who never touches their phone during class is still paying a cognitive tax for having it in their pocket. Teachers cannot confiscate a tax. Only removing the device removes the drain. A ban is the only intervention that addresses the mechanism the research actually identified. Journal of the Association for Consumer Research