USADA submitted an expert report of Dr. Bradley Johnson (“Dr. Johnson”), a
professor in the Department of Animal and Food Sciences at Texas Tech University, who has done extensive research in the area of steroidal implants in beef cattle, studying specifically the
administration of trenbolone in cattle in the U.S. and other countries and its effects, including the
amount of trenbolone residue in muscle tissue. This report states that, based on a number of
factors, including the typical timing and method of administration of trenbolone, the relatively short
half-life of trenbolone once it is hydrolyzed in the bloodstream of cattle, and normal excretion by the
animal, the residue levels for trenbolone in edible animal tissue (other than liver) is minimal.
Research trials cited in Dr. Johnson’s report indicate that expected residual levels would be between
0.05 to 0.6 ppb. Based on this data and his calculations, which assumed residual levels up to 33 times higher than those indicated by research trials, Dr. Johnson’s report indicates that it would not
be remotely possible for Respondent’s positive test to have resulted from ingestion of the ground
beef she points to as the source of her positive sample. Dr. Johnson’s report also states that the
concentration of trenbolone metabolite in Respondent’s urine sample is consistent with her
subcutaneous administration of approximately 20 to 40 mg of trenbolone in the 30-day period prior
to December 4, 2015.