The news comes at a bad time for defensive tackle Anthony "Freak" Johnson, whose positive test has come to light just 72 hours before the NFL draft.
Meanwhile, the agent for quarterback Zach Mettenberger, one of 10 players flagged for either testing positive or having what is called a diluted sample, said Mettenberger's was diluted.
According to the reports, Mettenberger's doctor explained the diluted sample was caused by Mettenberger's recovery from knee surgery, although it would still be considered a failed drug test under the current NFL substance abuse policy.
The reports said Mettenberger was advised to drink as much as a gallon to a gallon-and-a-half of water a day, because he was suffering from cramps.
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