If an athlete used an illegal performance-enhancing medication and this athlete's samples were lost, what might still contain the drug weeks to a few months later?

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The Answer is Proteins would really need the blood work as would the original compound. The urine would have the metabolites of medications but not the proteins or peptides. Hair samples are the only ones that might contain samples of the medication weeks to a few months later.

If an Athlete Used an Illegal Performance-Enhancing Medication and This