But he will compete for Britain at its own Games .
Dwain Chambers , the British 100 - meter sprint star , tested positive for a previously undetectable steroid in 2003 and received a two - year ban from track and a lifetime Olympic ban .
Dwain Chambers will compete for British at British 's own Games .
Dwain Chambers , the British 100 - meter sprint star , tested positive for a previously undetectable steroid in 2003 and received a two - year ban from track and a lifetime Olympic ban .