They did rule that the initial epi-test test was invalid:
In its 84-page decision, the majority found the initial screening test to measure Landis' testosterone levels — the testosterone-to-epitestosterone test — was not done according to World Anti-Doping Agency rules.
But the more precise and expensive carbon-isotope ration analysis (IRMS), performed after a positive T-E test is recorded, was accurate, the arbitrators said, meaning "an anti-doping rule violation is established."