After having won and lost the 100 metres Olympic Gold Medal 25 years ago, Ben Johnson has returned to Seoul.

The 1988 final has been called the Olympics' dirtiest race after six of the eight runners, including Johnson, were linked to doping.

Stripped of his title and later suspended, the Canadian is now fighting to eradicate drugs from sport.

Al Jazeera's Harry Fawcett reports from Seoul.

Source: Al Jazeera