Glasner won the 1,500 metres freestyle event at the World Swimming Short Course Championships in Istanbul on December 16, 2012.

Two days earlier, he had won a bronze in the 400m freestyle.

After winning the 400m title, Glæsner tested positive for the banned stimulant Levmetamfetamine.

He tested negative for all banned substances after winning his gold.

The Dane, who competed at the Beijing 2008 and London 2012 Olympics, said the substance got into his system when he used an American version of the Vicks Vapour Inhaler.

He explained he thought he was using the Danish version - which he knew did not contain any prohibited substances.

But because of an accidental mislabelling, making the American version of the product look like the Danish one, he used it.

The American Vicks Inhaler has a different chemical composition.

After the positive test, Glæsner was stripped of his gold and bronze medals and handed a three-month ban.

Mads Glæsner (left) had to return his bronze medal after the positive test, with New Zealand's Matthew Stanley being promoted into third ©AFP/Getty Images


In his appeal to the CAS, he did not contest the presence of the substance or the automatic disqualification of his 400m freestyle result, which saw him hand back a bronze medal.

But he called on the CAS to overturn his disqualification by the governing body FINA from the 1,500m freestyle race, in which he won a gold.

The case was referred to sole arbitrator, Professor Ulrich Haas of Germany, who found there was no reason for the disqualification from the December 16 race, as he had tested negative for all banned substances on that day.

In the 1,500m race, Italian Gregorio Paltrinieri was declared the gold medallist after Glæsner's initial disqualification.

But Paltrinieri will now be relegated back to the silver medal position after the decision by the CAS, with Pal Joensen of the Faroe Islands dropping from second back to third - where he finished in the race.

New Zealand's Matthew Stanley was retrospectively awarded Glæsner's 400m bronze.