5.4.2 When contact is made, the DCO /Chaperone shall :  ISTI – Effective 1 January 2023  Page 44 of 92 a) From the time of such contact until the Athlete leaves the Doping Control  Station  at the end of their Sample  Collection Session, keep the Athlete  under observation at all times;  b) Identify themselves to the Athlete using the documentation referred to in Article 5.3.3; and  c) Confirm the Athlete’s  identity as per the criteria established in Article 5.3.4.