Kammala wannan jumla: A 2012 United States Olympic Trials a Omaha, Nebraska, wasan da ya cancanta ga Ƙungiyar Olympics ta Amurka, Hansen ya lashe tseren mita 100 na karshe, ya cancanci ya yi iyo a wannan taron da kuma 4 × 100 mita medley relay a gasar Olympics ta 2012. Ya kuma yi tsere a tseren kafafu na mita 200 kuma ya zama na huɗu. A Wasannin Olympics na 2012 a London, Hansen ya gama na uku a tseren mita 100 don lambar tagulla, kuma ya lashe lambar zinare a matsayin memba na tawagar Amurka mai nasara a gasar
4×100-mita medley relay. (Wasan tseren tseren tseren tseren tseren tseren tseren tseren tseren tseren) A ƙarshen wasannin, Hansen ya yanke shawarar cewa wasannin Olympics na 2012 zai zama na ƙarshe, ya yi ritaya daga wasan wasan motsa jiki.