The substance is allowed in excess of limits - to a certain amount - if an athlete can prove the high levels are due to a required therapeutic .
Sundby crucially used a nebuliser to inhale his asthma medication .
The substance is allowed in excess of limits - to a certain amount - if an athlete can prove the high levels are due to a required therapeutic , but Sundby crucially used a nebuliser to inhale his asthma medication .