The two middleweight contestants on "The Ultimate Fighter 7" were scheduled to meet in a preliminary bout on the live season finale event.
According to Thomas Gerbasi of UFC.com, semifinalist Credeur alerted the Nevada State Athletic Commission of the drug during the weigh-ins on Friday, but traces of the drug was still found in his system when test results returned Saturday morning.
Adderall is a drug taken to treat attention-deficit hyperactivity disorder. In addition to what the NSAC considers performance-enhancing effects, it is a banned substance due to potential cardiac dangers brought on from the stress that accompanies fighting.
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