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 s atisfy all the requirements to establish “Presence” of a Prohibited Substance under Article  2.1.