Athletics - American Lawson banned for four years for positive drugs test

2016 Rio Olympics - Athletics - Final - Men's Long Final - Olympic Stadium - Rio de Janeiro, Brazil - 13/08/2016. - Jarrion Lawson (USA) of the United States competes in the Men's Long Jump final. REUTERS/Kai Pfaffenbach

(Reuters) - American long jumper and sprinter Jarrion Lawson has been suspended for four years after testing positive for the banned substance epitrenbolone, the Athletics Integrity Unit (AIU) said on Saturday.

Lawson, the world long jump silver medallist, has denied any wrongdoing, saying the substance could have entered his body through the consumption of tainted beef.