Final answer:
Athletes need to be concerned with doping even if they are not knowingly taking prohibited substances, as unintentional doping can occur through supplements or medication containing banned substances. Drug screening is rigorous in competitive sports to ensure fair play.
Step-by-step explanation:
Even if you are not knowingly taking substances on the prohibited list, there is a need to be concerned with the issue of doping because some supplements or medication may contain banned substances that are not immediately apparent. Therefore, the possibility of unintentional doping exists, and athletes are encouraged to be vigilant about everything they consume. In the context of competitive sports, drug screening is rigorous, and athletic performance can be scrutinized to the molecular level to ensure fair play. Ignorance is not considered a defense in doping cases, and athletes are responsible for any substance found in their bodies.