1. Terbutaline is a bronchodilator and, according to the IOC list of prohibited substances, is permitted by inhaler only when its use is previously certified in writing by a respiratory or team physician to the relevant medical authority. It is clear that there cannot be more than one relevant medical authority. Further, the athlete must know, or be able readily to ascertain, to whom the giving of such certification will operate so as to take Terbutaline off the prohibited substance list. It cannot be left to the AOC in an action against an athlete and, a fortiori, after the event, to say who it might in its discretion have treated as satisfying the description.