Each National Federation  shall in turn ensure that its members , and the constituents of its members , are also provided with the most recent version of the Prohibited List .17 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 Methods 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  16  [Comment to Article 3.2.3 (iii): World Skate would meet its burden to establish that such departure did not cause the Adverse  Analytical Finding by showing that, for example, the B Sample opening and analysis were observed by an independent witness and no irregularities were observed.]