At my school In-School-Suspension (ISS) is thought more of as a reward to students than a punishment. Students just go to this trailer and sit for the school day. During some parts of the day, students in ISS are allowed to wear hats, eat, watch YouTube videos, etc. This is clearly not punishment. One of my students told me Friday that he missed ISS. He said in ISS no one fusses at you when you do not work. In the regular classroom, teachers fuss at students when they do not work. How can teachers change this ISS system? To be clear, I do not write referrals, because clearly it would do nothing but show students I cannot handle students.
I would try to get the school to understand the problem and maybe try to get it to this point. If I were in this situation I would want it to get it to this point.
Talk to the ISS teacher. Rarely do I GET THE WORK from the other teachers for the student to do while they are there. Make sure you're providing your part of the process. It goes a long way in making that student's day successful academically. Repeat offenders that tell me they "like being there", seem to have difficulty keeping focused. The quiet environment gives them the opportunity to get work done, at their pace, without the distractions in their classroom. (Social and behavioural distractions.) It's definately not because it's fun.
I think the rules of ISS need to be changed. The rules shouldn't be so light. Since students are missing a day of class, they need to keep up with their school work. If they don;t show up, then that shouldn't be taken lightly either.