Drugs can be added and removed from this list by WADA annually, although not all of the banned substances are explicitly named. Caroline Hatton, PhD , a sports anti-doping science consultant, told in a Mar. 12, 2010 email that "A key concept in prohibited lists is that they avoid being finite. Instead of listing all banned drugs one by one, they list entire drug classes and name drugs merely as examples. This is to keep users who took designer drugs from claiming that they didn't break the rules because the drugs they took weren't listed."
Androstenedione: The test sensitivity for anabolic steroids in the standard LGC supplement screen is 10 ng/g (10 ppb). Androstenedione is known to be naturally present in milk and milk-derived products. The concentrations of androstenedione found in milk are variable, but are typically in the low ng/ml (low ppb) region. One reference cites values of around ng/ml. For this reason, the presence of androstenedione in milk or milk-derived supplement products and/or supplement ingredients analyzed using the standard LGC supplement screen is not reported unless the concentration exceeds 50 ng/g (50 ppb). 4