Tarhan became conscientious objector on October 27, 2001, detained on April 8, 2005 and was sent to the military unit in Tokat province on April 10, 2005.
27 Ekim 2001’de vicdani reddini açıklayan Tarhan, 8 Nisan 2005’te İzmir’de gözaltına alındıktan sonra 10 Nisan 2005’te Tokat’taki askeri birliğe gönderildi.