I'm not saying it isn't a classroom management technique, but I am saying that, if that child has an IEP requiring special seating (front of the class, away from the door, away from floruescent lights, a specific height desk, a desk with an attached figit, inclusive seating, a desk facing natural light, a desk away from natural light, etc,) you may be violating their IEP. Believe it or not, many IEPs clearly state that a child may NOT be moved away (or excluded) from a group. The IEP sometimes removes that option of behavior management from us, as teachers. I know that in my school district, I am not at liberty to share the specifics of IEPs with substitutes unless they are long term. I'd say, when in doubt, don't.