In School Suspension (ISS) is Christmas-come-early to beleagured teachers. Students are assigned to ISS when they have been particularily naughty - like fights, death threats, porn etc. Often, these same students are the ones that make a teacher's job, well, hell.
This is the student that won't sit down, won't shut up, won't turn in any work, and probably won't go to the next grade without summer school.
Teachers get notification when students are assigned to ISS and teachers send seat work to be completed while the student serves his/her sentence in ISS. These ISS notifications are often received with the same glee as a winning lottery ticket.