The actual text of the Constitution is the final and absolute yardstick all laws are measured against. When the Supreme Court considers the constitutionality of any law it must measure the law against the original text of the constitution and its plain meaning when it was written.
Notice of working hours/changes. Your employer must give you reasonable notice of any changes to your working hours, such as cancelling your shifts. They may request last minute changes (such as ringing you that morning to say that they do not require you to work) and you can choose to agree to this change.
overtime and work hours When is overtime due? For covered, nonexempt employees, the FLSA requires overtime pay at a rate of not less than one and one-half times an employee's regular rate of pay after 40 hours of work in a workweek. Some exceptions to the 40 hours per week standard apply under special circumstances to police officers and fire fighters employed by public agencies and to employees of hospitals and nursing homes.