As noted in the Comme nt to Article 3.2, unlike th e proof required to establish an anti -doping rule violation unde r Article  2.1, Use or Attempted Use may also be established by other reliable means such as admissions by the Athlete, witness statements, documentary evidence, con clusions drawn from longitud inal profiling, including data collected as part of the Athlete Biological Passport, or other analytical information which does not otherwise satisfy all the requirements to establish “Presence” of a Prohibited Substance under A rticle  2.1.