The Athlete or other Person may rebut this presumption by establishing that a departure from the International Standard for Laboratories occurred which could reasonably have caused the Adverse Analytical Finding.If the Athlete or other Person rebuts the preceding presumption by showing that a departure from the International Standard for Laboratories occurred which could reasonably have caused the Adverse Analytical Finding, then the Anti-Doping Organization shall have the burden to establish that such departure did not cause the Adverse Analytical Finding.2120 [Comment to Article 3.2.1: For certain Prohibited Substances, WADA may instruct WADA-accredited laboratories not to report Samples as an Adverse Analytical Finding if the estimated concentration of the Prohibited Substance or its Metabolites or Markers is below a Minimum Reporting Level.