(However, the presence of a Prohibited Substance or its   IRF 2021 Anti-Doping Rules Page 8 of 68     2.3  Evading, Refusing or Failing to Submit to Sample Collection by an Athlete  Evading Sample collection; or refusing or failing to submit to Sample collection without compelling justification after notification by a duly authorized Person.6  2.4  Whereabouts Failures by an Athlete  Any combination of three (3) missed tests and/or filing failures, as defined in the International Standard for Results Management, within a twelve (12) month period by an Athlete in a Registered Testing Pool.