Kingston (dpa) - Sprint superstar Usain Bolt may lose his team relay gold medal from the 2008 Olympic Games as his Jamaician teammate Nesta Carter submitted a positive B-sample, according to a local report.The Jamaica Gleaner dailyreported late Thursday that Carter‘s B-sample following the 4x100m relay had tested positive for the banned substance methylhexanamine.Bolt and Carter teamed up with Michael Frater and Asafa Powell to take the 4x100m gold in Beijing.