Heavy consumption of the essential amino acid lysine (as indicated in the treatment of cold sores) has allegedly shown false positives in some and was cited by American shotputter C. J. Hunter as the reason for his positive test, though in 2004 he admitted to a federal grand jury that he had injected nandrolone.  A possible cause of incorrect urine test results is the presence of metabolites from other AAS, though modern urinalysis can usually determine the exact steroid used by analyzing the ratio of the two remaining nandrolone metabolites. As a result of the numerous overturned verdicts, the testing procedure was reviewed by UK Sport . On October 5, 2007, three-time Olympic gold medalist for track and field Marion Jones admitted to use of the drug, and was sentenced to six months in jail for lying to a federal grand jury in 2000. 
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The author concludes that when physicians need to use a medication known to have the effect of prolonging the QT interval, a review of other risk factors that may increase the likelihood that torsades de pointes will develop is recommended. Therefore, an elderly woman with heart failure who also takes medications that might indirectly lead to increased risk (., diuretic use causing hypokalemia) would be a particularly risky candidate for use of a drug that prolongs the QT interval. Close clinical and electrocardiographic monitoring would be prudent during treatment.