"This chronic lack of clarity from Ottawa is the reason why Canadian Depository for Securities Ltd. (CDS) is worried about potential liabilities it would face if it facilitated a trade involving a pot-selling company that does business in the United States." 
The G&M is trying to gussy-up a weasel! Why, pray tell, did the Clearing House alow the trades to proceed in the first place. As W&B said many years ago - "follow the money" - that should lead right back to these banksters!