Complex sentence: To allow such unrestricted roving patrol stops would be to subject all residents of the border area to unreasonable searches and seizures just because of their ethnicity, therefore the stop of the defendant was a violation of the Fourth Amendment and the charges were dropped.
Split into simpler sentences: To allow such unrestricted roving patrol stops would be to subject all residents of the border area to unreasonable searches and seizures just because of their ethnicity. Therefore the stop of the defendant was a violation of the Fourth Amendment and the charges were dropped.