The Danish Swimming Federation announced today that FINA has handed Mads Glæsner a 3-month ban for doping at the Istanbul 2012 World Swimming Championships (25m). I will try to explain the situation briefly here in the following, but read the official press release if you can, or wait for the press release from FINA.
The substance in question is Levmetamfetamine, which Glæsner tested positive for after the 400 meter freestyle finale, where he was third. He will loose that bronze medal, but apparently not the gold medal in the 1500 meter freestyle two days later, since that test came out negative.

Glæsner explains that the positive test was because of him accidentally using a US version of the Vicks Vapor Inhaler, which in contrast to the Danish version contains Levmetamfetamine. The Danish Swimming Federation explains that the amount of Levmetamfetamine measured in the doping test was miniscule.
The quarantine period started on March 19th, which almost certainly means that Glæsner will miss out on the Barcelona 2013 World Swimming Championships. The Danish Federation gave exemption to a few swimmers to make the Barcelona 2013 cut also after the Danish Trials on 26-29 March 2013, which means that Glæsner could maybe make the cut when his ban is lifted on June 19; but it seems a bit far fetched.
Press release from the Danish Swimming Federation (in Danish) …
Dopingdom til svømmeren Mads Glæsner
Svømmeren Mads Glæsner er af Fina (det internationale svømmeforbund) blevet testet positiv for brug af et forbudt stof under VM på kortbane i december 2012. Fina idømmer Mads Glæsner tre måneders karantæne samt fratagelse af VM-bronzemedaljen i 400 m fri.
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