I have heard that there is a law that employers have to pay a minimum of hours worked for part time employees who work on the clock. In California, for example, it is 3 hours. This is required if the employee comes in on a day when they are scheduled to work longer, but are sent home early, or on a day when they are not regularly scheduled to work. There are also some exceptions if the short hours are due to acts of God. Should Know About Your Rights .
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