[Comment to Article B.1.1: While a single Whereabouts Failure will not amount to an anti-doping rule violation under Code  Article 2.4, depending on the facts, it could amount to an anti-doping rule violation under Code  Article 2.3 (Evading Sample Collection) and/or Code  Article 2.5 (Tampering or Attempted Tampering with Doping Control).]