5.1.2  Testing  shall be undertaken to obtain analytical evidence as to whether the Athlete  has violated Article 2.1 ( Presence  of a Prohibited Substance  or its  22  [Comment to Article 4.4.7.1: WADA  shall be entitled to charge a fee to cover the costs of: (a) any review it is required to conduct in accordance with Article 4.4.7; and (b) any review it chooses to conduct, where the decision being reviewed is reversed.]