4.2  Prohibited Substances  and Prohibited Methods  Identified on the Prohibited List   4.2.1   Prohibited Substances and Prohibited Methods   The Prohibited List shall identify those Prohibited Substances and Prohibited Me thods which are prohibited as doping at all times (both In-Competition and Out-of-Competition) because of their potential to enhance performance in future Competitions or their masking potential, and those substances and methods which are prohibited In-Competition only.