USADA, the independent administrator of the UFC's anti-doping policy, would handle "the appropriate adjudication of this case," the UFC said, adding that a full review process was assured under the policy before any sanctions may be imposed.
Justino last fought on Sept. 24, stopping Lina Lansberg in the second round as part of a UFC Fight Night event in her native Brazil.
The 31-year-old (17-1) previously tested positive for an anabolic steroid in December 2011, which she blamed on a diet supplement she received from a former coach.
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(Reporting by Larry Fine in New York; Editing by Peter Rutherford)
