Nesta Carter appealing disqualification that cost Usain Bolt his 'triple-triple'

Carter tested positive for methylhexaneamine last year in a reanalysis program of samples from the 2008 Beijing Olympics and 2012 London Olympics

Nesta Carter (left) returned a failed drug test from his Beijing 2008 'A' sample (Getty)

Jamaican sprinter Nesta Carter is at the Court of Arbitration for Sport to appeal against disqualification from the 2008 Olympics in a doping case that cost Usain Bolt a 4x100-meter relay gold medal.

Carter shielded his face from media on arriving at sport's highest court on Wednesday for a closed-doors hearing expected to last all day. A verdict is expected within weeks.

The 32-year-old Carter is challenging his disqualification imposed by the International Olympic Committee for a positive test for a banned stimulant.

(L-R) Nesta Carter, Michael Frater, Usain Bolt and Asafa Powell celebrate Jamaica's 4x100m relay victory in 2008 (Getty)

Carter tested positive for methylhexaneamine last year in a reanalysis program of samples from the 2008 Beijing Olympics and 2012 London Olympics.

The case spoiled Bolt's perfect Olympic record of three gold medals — in the 100, 200 and 4x100 — at three consecutive games from 2008-2016.

AP