The CCES uses the Tasso-M20 device, typically placed on an athlete’s upper arm. The device has a small needle that will puncture the skin, collecting four pods of blood, which are then sealed and shipped to a WADA-accredited laboratory for analysis. The athlete will operate the Tasso-M20 device themselves, so only a doping control officer (DCO) needs to be present. Blood collection officers (BCO) are not involved in DBS testing.