I once knew a guy who was HR Manager of a manufacturing plant in Michigan. His company had set up a Rubber Room with games, VCR’s, televisions, books and magazines, etc.
He explained that it was actually cheaper to have injured employees come to work, clock in and screw around all day than to have them collect Workers Comp under Michigan rules.
Keep the rubber rooms.
Lock the door on time - nobody in after start of day(no pay)
No internet. In fact, install blocking equipment for wireless computer and cellphone. Have a secretary take incoming messages only.
Sack lunch only no leaving the building until end of work day. If you leave early, you lose the full day’s pay.
Cases will be ‘fast-tracked’ at the request of the offending teachers in most cases.