I am no great fan of Michael Chavis (and no fan of steroids), but this matter may point up the difficulty of monitoring every substance that enters the body.
From medical prescriptions to over-the-counter supplements to protein shakes, a player places great trust that the provider is not dispensing a banned substance.
On one hand, Chavis may have knowingly consumed a banned substance in hopes of enhancing his performance.
On the other hand, as Chavis contends, the top prospect may have no idea how the banned substance turned up in his urine.