Any competitive results obtained in violation of this Article 5.6.1 will be Disqualified, unless the Athlete can establish that they could not have reasonably known that they participated in an International Event or a National Event.5.6.2  If an Athlete retires from sport while subject to a period of Ineligibility, the Athlete must notify the IBU/BIU (and, if the period of Ineligibility was not imposed under the IBU Anti-Doping Rules, the Anti-Doping Organisation that imposed the period of Ineligibility) in writing of such retirement.