<prompt> Bhala okuqhubekayo kwalesi sigaba - uBarros uzonikezwa indondo yethusi ye-4 × 100 metres relay kuma-Olympics asehlobo ka-2008  <response>: kulandela ukwehliswa esikhundleni ngo-2017 kweqembu laseJamaica ngenxa yokuhluleka kokuhlolwa kwe-anti-doping kukaNesta Carter. 