<blockquote>“They use the violation as a legal justification for the stop but then proceed with inquiries and, sometimes, searches,” Epp said. “Not surprisingly, the drivers who experience these stops come to deeply resent the experience.”</blockquote>
via <a href="http://www.postandcourier.com/article/20150801/PC16/150809965">Pull Over: Practice of pretext police stops under fire - Post and Courier</a>.