An appellate court is a court that hears cases on appeal from another court.
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Police officers would need to know about bill of rights so that they make sure that they are being fair during an arrest, or any other police duty. For example, the first amendment of the bill of rights states that everyone should have freedom of religion, speech and press. An officer can NOT arrest a person who is giving a speech to fellow people about how he/she feels about the nation/government, because of the first amendment.
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In fact, historically, most American non-public schools have been Catholic schools, many of them elementary schools attached to a local parish church. Parochial schools were originally designed to maintain the Catholic faith and culture, combating the perceived threat posed by Protestantism.