Tracking time off for salaried employees

Q. If a company tracks employees' vacation, sick and personal time off, can we make deductions from accumulated time for everyone who takes time off, including salaried employees? I'm talking about deducting it from the accrual, not the pay. I've heard that I can't deduct vacation, sick leave or personal time if the salaried employee worked at least four hours during that day. —S.W., Florida