We are planning a forced time off without pay to avoid layoffs. In order to ease the effect we are having employees take off 1 day every other week over a 3 month period. Can we do this with salaried employees since they will be working the 4 other d

We are planning a forced time off without pay to avoid layoffs. In order to ease the effect we are having employees take off 1 day every other week over a 3 month period. Can we do this with salaried employees since they will be working the 4 other days? Do we need to have our employees sign something to protect us?