Jiri Dvorak, chief medical officer for world football's governing body, said samples provided by players from 19 of the 24 squads at the tournament - that ended in July - tested positive for banned substance clenbuterol.
From Soccerway.com:
After four players at the youth competition tested positive, FIFA opted to analyse all 208 urine samples collected, with the steroid found to be present in more than half of them.Suspicions were aroused by the fact five players from Mexico's senior squad for the CONCACAF Gold Cup had previously tested positive for the same substance in May.The players were later deemed to have unwittingly ingested the drug through tainted food consumed on a training camp in Mexico.
"FIFA was very alarmed and it was highly surprising to see something like this – I had not seen anything like it in my 20 years in this post," Dvorak said.
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