text: Some students like to hide their emotions from the teacher or other students. Some don't want people to know what they are feeling, because its their own business. Students wouldn't want their teachers walking up to them asking what is wrong, and the students said something like how do you know there is something wrong. Then the teacher says I used the emotional expression technology. The student would just feel awkward, because the teacher just figured out their emotions when they probably wanted to keep it to themselves. This is why the use of technology to read the emotion expressions of students in a classroom is not valuable.   All teachers and principals know that students use their cell phones during class even though it's not permitted. Why keep it a secret any longer? I think that the principal should choose policy A because the parent might need to get a-hold of the student during school for something extremely important, the student will most likely use their cell phone less during class from using it in their free periods, and there is no use not letting the student use their cell phone during a free period if they're not doing anything to begin with. These are some reasons why I think the principal should go with policy A.