8.2.4  Where multiple Samples  were provided by an Athlete on the same day from different Sample Collection Sessions  and are present in a Passport , the APMU  may invalidate all but one Sample after assessment by the APMU  in consultation with the Passport Custodian, as required  8.2.5  For urine Samples  where a substance(s) that may alter the steroid profile is detected by the Laboratory  (e.g., alcohol), the APMU  may invalidate the Sample when it is considered to affect the sensitivity of the Adaptive Model  to detect changes in future Samples .