A combination of pre-tournament and in-tournament samples were taken, and the 24 qualified teams were visited by doping control officers from UEFA and national anti-doping agencies (NADOs).
Blood, urine and serum samples were taken, and have been analysed by the WADA-accredited French anti-doping laboratory at Chatenay-Malabry, close to Paris.
The 2015-2016 season also brought the introduction of the Athlete Biological Passport (ABP) to monitor players over time, and provide intelligence for target testing. This is seen as a significant deterrent to any player who might consider blood doping or taking banned steroids.
In another deterrent measure, UEFA has introduced a long-term sample-storage programme. Samples from EURO and the major club competitions will be stored, which means that UEFA will be in a position to reanalyse them when required, due to intelligence received or new analytical techniques becoming available.