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PA does not have any laws pertaining to break periods for the adult employee. therefore, federal law applies and there is no mandate for specific breaks or meal periods; however, it does give guidance as to whether or not an employee should be paid during these times.
short breaks are usually 20 minutes or less, and should be counted as hours worked. "meal periods" which last 30 minutes or more do not need to be compensated as work time - of course, that only applies if the employee is completely relieved of his or her duties during the meal break
you can use this link to read the federal department of labor informaiton on this matter.
i am sorry you have encountered this situation. your employer can establish two to three breaks a day at 15 minutes or so and they can establish policy that employess should use the bathroom at that time- if you are asking if you have legal recourse to sue for the embarassment - my opinion is no, as long as there is policy to bathroom breaks.