On 11 August, the Jamaican national team, led by Nesta Carter, Michael Frater, Yohan Blake and Usain Bolt, won the gold medal and broke their own world record of 37.04 set at the 2011 World Championships in Athletics, with a time of 36.84.
In May 2014, the US 4x100m relay team member Tyson Gay received a one-year suspension for anabolic steroid use and was stripped of his medals and disqualified from all results after 15 July 2012 when he first used.