The Direct Marketing Association had challenged a Colorado law requiring out-of-state merchants to collect and remit sales tax on sales within the state, as well as tell consumers of their obligation to pay sales tax. The U.S. Supreme Court refused to hear an appeal from a federal appellate court, which means that the Colorado law can continue. The trade group argued that this law violates the Constitution’s commerce clause and is counter to a prior Supreme Court decision preventing states from collecting sales tax from merchants that do not have a physical presence in the state.