According to WADA, trafficking is:
Trafficking: Selling, giving, transporting, sending, delivering or distributing (or Possessing for any such purpose) a Prohibited Substance or Prohibited Method (either physically or by any electronic or other means) by an Athlete, Athlete Support Person or any other Person subject to the jurisdiction of an Anti-Doping Organization to any third party; provided, however, this definition shall not include the actions of “bona fide” medical personnel involving a Prohibited Substance used for genuine and legal therapeutic purposes or other acceptable justification, and shall not include actions involving Prohibited Substances which are not prohibited in Out-of-Competition Testing unless the circumstances as a whole demonstrate such Prohibited Substances are not intended for genuine and legal therapeutic purposes or are intended to enhance sport performance.
So it almost is a non-issue BUT for the last line.
Basically says things that are only banned in-season are ok to traffic provided you are out of season and
"unless the circumstances as a whole demonstrate such Prohibited Substances are not intended for genuine and legal therapeutic purposes "
Cocaine has no legal use. This in-season delineation is there as there are plenty of legal things that are banned by WADA and athletes can use them out of season.
Also, I'm assuming Hunt is out of season as despite rumours he was going to play with Brisbane City he did not, training with them isn't competition I believe.
Another important part of WADA code:
[Comment to Articles 2.6.1 and 2.6.2: Acceptable justification would not include, for example, buying or Possessing a Prohibited Substance for purposes of giving it to a friend or relative, except under justifiable medical circumstances where that Person had a physician’s prescription, e.g., buying Insulin for a diabetic child]
So if a hypothetical footballer acquired cocaine and gave it to a friend or family member, even if they aren't involved in sport, they have trafficked the drug under the WADA code.