High school students aren't really all that smart, they still confiscate 200 phones at a school that has 1100 students, not the brightest bunch, and no it's not a "Special" school
Teachers can take the phones even if they are not using them, it sounds a little evil, but lets face it when I was in high school the teacher would whack us across the knuckles with a pointer if we were caught talking in class, I still have an aversion to Nuns