Jamaican sprinter Steve Mullings has received a two-year ban after twice testing positive for testosterone.
Mullings, 22, was tested after his 200m win at the national trials last summer and subsequently missed the Olympics.
The Jamaica Amateur Athletic Association has voided all of Mullings' performances since the tournament.
"This violation constitutes an offence which now makes Mr Mullings ineligible to compete for a period of two years," the JAAA said in a statement.