Proportionality    ISPPPI – November  2021 Page 23 of 24  Module  Data  Retention Periods  Remarks  Criteria  4 – Testing      Testing  Doping Control  Forms (DCFs)  10 yrs as of Sample  collection date DCFs, associated mission/ Testing  orders, and chain of custody documents are relevant for Athlete Biological Passport and in case of re-Testing of Samples .