When 15-year-old Chelsea Rhoades left for school early one day last December, her family expected it to be just another normal, uneventful day at one of Indiana’s premier public high schools. But school officials had slightly different plans. When Chelsea arrived in her school homeroom that day, her teacher directed everyone who did not have an opt-out slip to another classroom. Only five students had slips. The rest, who had no idea what the teacher was talking about, were divided into groups of 10-15, herded into classrooms and placed in front of computers. Chelsea, who was busy helping a friend...