a 2014 decision
... that the U.S. Supreme Court ruled in a 2014 decision that police officers may conduct traffic stops even if they have not personally observed a traffic violation?
... that the <a href="./Supreme_Court_of_the_United_States" id="mwBbs" rel="mw:WikiLink" title="Supreme Court of the United States">U.S. Supreme Court</a> ruled in <b id="mwBbw"><a class="mw-redirect" href="./Prado_Navarette_v._California" id="mwBb0" rel="mw:WikiLink" title="Prado Navarette v. California">a 2014 decision</a></b> that police officers may conduct traffic stops even if they have not personally observed a traffic violation?