In one of our IT rooms we keep having keyboards and mice unplugged, sometimes left loose or plugged into other machines. The room is long and narrow with beams so students are often messing around with the PCs in there without teachers noticing.
Any ideas on how to help prevent this? I have considered 20mm padlocks attached to back of PC (small enough not to allow USB end to be pulled through) but can't find any that are well made for a decent price.