As noted in the Comment to Article 3.2, unlike the proof required to establish an anti -doping rule violation under 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, conclusions drawn from longitudinal profiling, including data collected as part of the Athlete Biological Passport, or other analytical information which does not otherwise satisfy all the requirem ents to establish “Presence” of a Prohibited Substance under Article  2.1.