When a Prohibited Substance or itsMarker s or Metabolite s is detected in anAthlete 's Sample in violation of Article 2.1(Presence of a Prohibited Substance or itsMetabolite s or Marker s), the Athlete mustpositive test resulting from a mislabeledor contaminated vitamin or nutritionalsupplement (Athletes  are responsiblefor what they ingest (Article 2.1.1)and have been warned againstthe possibility of supplementcontamination); (b) the administrationof a Prohibited Substance by theAthlete’s personal physician or trainerwithout disclosure to the Athlete(Athletes are responsible for theirchoice of medical personnel and foradvising medical personnel thatthey cannot be given any ProhibitedSubstance); and (c) sabotage of theAthlete’s food or drink by a spouse,coach or other Person within theAthlete’s circle of associates (Athletesare responsible for what they ingestand for the conduct of those Personsto whom they entrust access to theirfood and drink).