Reprieve for Lewis-Francis

His gold medal from Madrid was revoked but he was not banned for any further tournaments because – while listed as a "specified substance" on the World Anti-Doping Agency (WADA) Prohibited List - the drug is not deemed performance enhancing and he was accepted to have ingested it inadvertently through passive smoking at a party.

However, the British Olympic Association (BOA) has a bylaw that denies selection to a British Olympic team for life to any athlete guilty of a doping offence, as seen in the case of Dwain Chambers.

Lewis-Francis successfully appealed against the automatic ban.

"The BOA continues to believe that its lifetime ban for anyone found guilty of a doping offence sends the strongest possible message to everyone in sport that we will not tolerate the use of performance enhancing drugs," BOA chief executive Simon Clegg said in a statement.

"Anyone who contemplates cheating in this way should consider the consequences and understand that being found guilty of a doping offence will automatically end their Olympic aspirations."

At the time of Lewis-Francis' exposure to cannabis fumes the illegality of the drug had been downgraded in the UK, with authorities tolerating its use in private.