PARIS (AP) — Despite what it calls the most comprehensive anti-doping program at a European Championship, UEFA says some players might go through the tournament without being blood-tested.

UEFA revealed the details of its anti-doping plans for the month-long tournament on Tuesday at the French anti-doping laboratory, where samples will be tested.

Euro 2016 starts on Friday in France.

Marc Vouillamoz, the UEFA head of medical and anti-doping, said all players from the 24 teams have been in a testing pool since January. But because some national anti-doping organizations don’t perform blood collection, Vouillamoz said “it may be that some players did not have a blood test.”

UEFA will, however, carry out targeted doping tests during the tournament from June 10-July 10, and Vouillamoz said “it’s very unlikely that some players won’t be tested at all.”

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