The sanctions pertaining to Taher's over-age in competitions were finally announced in August 2007. His performances at the 2005 World Youth Championships, the 2007 World Cross Country Championships and the 2006 World Junior Championships were annulled, meaning that Taher lost his medals and the world youth best performance. He was not disqualified from senior meets such as the World Championships or the Asian Games or the 2005 World Cross Country Championships because he was found to hold junior age at that time. The disqualifications of Taher were particularly beneficial for Moroccan runner Abdelghani Aït Bahmad, who moved up from fourth place to bronze medal position at both the 2005 World Youth and the 2006 World Junior Championships.