The tests reportedly took place from June 20 through the 23 and according to the Jamaican Gleaner, a total of four players, two throwers and two sprinters, failed to pass them.
There has been no official confirmation about the findings.
The revelation about the sprinters drug use comes a day after news broke that American sprinter Tyson Gay tested positive for banned substances in May and would not be allowed to compete in the World Championship next month.
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